Patent Publication Number: US-2013237262-A1

Title: Method and apparatus for adjustments for delta-based power control in wireless communication systems

Description:
CROSS-REFERENCE 
     This application claims the benefit of U.S. Provisional Application Ser. No. 60/843,365, filed Sep. 8, 2006, entitled “METHODS AND APPARATUS FOR ADJUSTMENTS FOR DELTA-BASED POWER CONTROL IN WIRELESS COMMUNICATION SYSTEMS,” and U.S. Provisional Application Ser. No. 60/862,765, filed Oct. 24, 2006, entitled “METHODS AND APPARATUS FOR ADJUSTMENTS FOR DELTA-BASED POWER CONTROL IN WIRELESS COMMUNICATION SYSTEMS,” the entireties of which are incorporated herein by reference. The present application for patent is a Divisional and claims priority to patent application Ser. No. 11/848,865 entitled “Method and apparatus for adjustments for delta-based power control in wireless communication systems” filed Aug. 31, 2007, and assigned to the assignee hereof and hereby expressly incorporated by reference herein. 
    
    
     BACKGROUND 
     I. Field 
     The present disclosure relates generally to wireless communications, and more specifically to techniques for power and interference control in a wireless communication system. 
     II. Background 
     Wireless communication systems are widely deployed to provide various communication services; for instance, voice, video, packet data, broadcast, and messaging services may be provided via such wireless communication systems. These systems may be multiple-access systems that are capable of supporting communication for multiple terminals by sharing available system resources. Examples of such multiple-access systems include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, and Orthogonal Frequency Division Multiple Access (OFDMA) systems. 
     A wireless multiple-access communication system can simultaneously support communication for multiple wireless terminals. In such a system, each terminal can communicate with one or more sectors via transmissions on the forward and reverse links. The forward link (or downlink) refers to the communication link from the sectors to the terminals, and the reverse link (or uplink) refers to the communication link from the terminals to the sectors. 
     Multiple terminals can simultaneously transmit on the reverse link by multiplexing their transmissions to be orthogonal to one another in the time, frequency, and/or code domain. If complete orthogonality between transmissions is achieved, transmissions from each terminal will not interfere with transmissions from other terminals at a receiving sector. However, complete orthogonality among transmissions from different terminals is often not realized due to channel conditions, receiver imperfections, and other factors. As a result, terminals often cause some amount of interference to other terminals communicating with the same sector. Furthermore, because transmissions from terminals communicating with different sectors are typically not orthogonal to one another, each terminal may also cause interference to terminals communicating with nearby sectors. This interference results in a decrease in performance at each terminal in the system. Accordingly, there is a need in the art for effective techniques to mitigate the effects of interference in a wireless communication system. 
     SUMMARY 
     The following presents a simplified summary of the disclosed embodiments in order to provide a basic understanding of such embodiments. This summary is not an extensive overview of all contemplated embodiments, and is intended to neither identify key or critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts of the disclosed embodiments in a simplified form as a prelude to the more detailed description that is presented later. 
     The described embodiments mitigate the above-mentioned problems by providing techniques for controlling reverse link transmission resources to manage observed interference in a wireless communication system. More particularly, a terminal in a wireless communication system can adjust resources used for reverse link communication with an access point using one or more delta-based power control techniques. For example, a terminal can utilize one or more delta-based power control techniques described herein when the terminal engages in transmission on the reverse link with a serving access point after a predetermined period of silence or after receiving indications of interference from neighboring access points. A terminal can first compute a delta value through open-loop projection, based on which transmission resources such as bandwidth and/or transmit power can be increased or decreased to manage interference caused by the terminal. In addition, the delta value, other feedback from the terminal, and/or indications of interference caused by the terminal can be communicated as feedback to the serving access point to allow the access point to further assign transmission resources for the terminal. 
     According to an aspect, a method for power control in a wireless communication system is described herein. The method can comprise determining whether a prior transmission occurred before a predetermined threshold. In addition, the method can include computing one or more of an open loop delta value, an open loop delta value based on an assigned bandwidth, and a bandwidth based on a delta value. Further, the method can comprise adjusting one or more parameters to be used for a future transmission based at least in part on the computed values. 
     Another aspect relates to a wireless communications apparatus that can comprise a memory that stores data relating to a time at which a prior transmission was conducted and a threshold. The wireless communications apparatus can further include a processor configured to determine whether the prior transmission occurred earlier than the threshold and, upon a positive determination, to compute one or more of an open loop delta value, an open loop delta value based on an assigned bandwidth, and a bandwidth based on a delta value and to adjust a parameter to be used for transmissions based on the computed values. 
     Yet another aspect relates to an apparatus that facilitates reverse link power control in a wireless communication system. The apparatus can comprise means for conducting a transmission to a serving sector on a reverse link. In addition, the apparatus can comprise means for determining whether the transmission occurred outside of a timing threshold. Further, the apparatus can include means for computing an open loop delta value, an open loop delta value, or a bandwidth based on a delta value upon a positive determination. The apparatus can also include means for means for adjusting a parameter utilized for conducting transmissions to the serving sector based on the computed value. 
     Still another aspect relates to a computer-readable medium that can comprise code for causing a computer to conduct a reverse link transmission to a base station after a predetermined timing threshold. The computer-readable medium can further include code for causing a computer to compute one or more open loop delta-based parameters. In addition, the computer-readable medium can include code for causing a computer to adjust one or more of a bandwidth and a transmit power used for future transmissions to the base station based at least in part on the computed open loop delta-based parameters. 
     According to another aspect, an integrated circuit is described herein that can execute computer-executable instructions for reverse link power control and interference management in a wireless communication system. These instructions can comprise conducting a reverse link transmission to a serving sector. Additionally, the instructions can comprise determining whether an OSI indication corresponding to the reverse link transmission has been received. Further, the instructions can include adjusting one or more parameters to be used for future reverse link transmissions based at least in part on whether an OSI indication has been received. 
     According to yet another aspect, a method for conducting reverse link power control in a wireless communication system is described herein. The method can comprise receiving one or more of a communication request and power control feedback information from a terminal. In addition, the method can include receiving a report of OSI activity caused by the terminal. Further, the method can comprise assigning a parameter to be used for communication by the terminal based on the received information and the received report of OSI activity. 
     Another aspect relates to a wireless communications apparatus that can comprise a memory that stores data relating to a report of OSI activity caused by an access terminal and power control feedback information received from the access terminal. In addition, the wireless communications apparatus can comprise a processor configured to generate an assignment for transmission resources based on at least one of the report of OSI activity and the power control feedback and to communicate the assignment to the access terminal. 
     Yet another aspect relates to an apparatus that facilitates reverse link power control and interference management in a wireless communication system. The apparatus can comprise means for receiving power control information and OSI information corresponding to a wireless terminal. Further, the apparatus can include means for assigning one or more of a transmit power and a bandwidth to the wireless terminal based at least in part on the received information. The apparatus can additionally include means for communicating an assigned transmit power or an assigned bandwidth to the wireless terminal. 
     Still another aspect relates to a computer-readable medium that can include code for causing a computer to receive a report of OSI activity caused by a terminal. Further, the computer-readable medium can include code for causing a computer to generate an assignment for one or more of a transmit power or a bandwidth to be utilized by the terminal based at least in part on the received report. In addition, the computer-readable medium can further include code for causing a computer to communicate the assignment to the terminal. 
     An additional aspect described herein relates to an integrated circuit that can execute computer-executable instructions for reverse link power and interference control in a wireless communication system. These instructions can comprise receiving feedback from a terminal, the feedback comprising a report of OSI indications received by the terminal. Further, the instructions can comprise assigning transmission resources to the terminal based on the received feedback. In addition, the instructions can include communicating the assigned transmission resources to the terminal. 
     To the accomplishment of the foregoing and related ends, one or more embodiments comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects of the disclosed embodiments. These aspects are indicative, however, of but a few of the various ways in which the principles of various embodiments may be employed. Further, the disclosed embodiments are intended to include all such aspects and their equivalents. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  illustrates a wireless multiple-access communication system in accordance with various aspects set forth herein. 
         FIGS. 2A-2B  illustrate operation of an example system for delta-based power control in a wireless communication system in accordance with various aspects. 
         FIGS. 3A-3B  illustrate operation of an example system for reverse link power control and interference management in a wireless communication system in accordance with various aspects. 
         FIG. 4  illustrates an example reverse link transmission timeline in accordance with various aspects. 
         FIG. 5  is a flow diagram of a methodology for adjusting reverse link transmission resources in a wireless communication system. 
         FIG. 6  is a flow diagram of a methodology for adjusting reverse link transmission resources to reduce interference in a wireless communication system. 
         FIG. 7  is a flow diagram of a methodology for conducting reverse link power control and interference management in a wireless communication system. 
         FIG. 8  is a block diagram illustrating an example wireless communication system in which one or more embodiments described herein may function. 
         FIG. 9  is a block diagram of a system that facilitates reverse link power control in accordance with various aspects. 
         FIG. 10  is a block diagram of a system that coordinates reverse link power control and interference management in accordance with various aspects. 
         FIG. 11  is a block diagram of an apparatus that facilitates initial transmission resource adjustments in a wireless communication system. 
         FIG. 12  is a block diagram of an apparatus that facilitates adjusting reverse link transmission resources for interference control in a wireless communication system. 
         FIG. 13  is a block diagram of an apparatus that facilitates reverse link power control and interference management in a wireless communication system. 
     
    
    
     DETAILED DESCRIPTION 
     Various embodiments are now described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more aspects. It may be evident, however, that such embodiment(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments. 
     As used in this application, the terms “component,” “module,” “system,” and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component may be, but is not limited to being, a process running on a processor, an integrated circuit, a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or thread of execution and a component may be localized on one computer and/or distributed between two or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network such as the Internet with other systems by way of the signal). 
     Furthermore, various embodiments are described herein in connection with a wireless terminal and/or a base station. A wireless terminal may refer to a device providing voice and/or data connectivity to a user. A wireless terminal may be connected to a computing device such as a laptop computer or desktop computer, or it may be a self contained device such as a personal digital assistant (PDA). A wireless terminal can also be called a system, a subscriber unit, a subscriber station, mobile station, mobile, remote station, access point, remote terminal, access terminal, user terminal, user agent, user device, or user equipment. A wireless terminal may be a subscriber station, wireless device, cellular telephone, PCS telephone, cordless telephone, a Session Initiation Protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device having wireless connection capability, or other processing device connected to a wireless modem. A base station (e.g., access point) may refer to a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminals. The base station may act as a router between the wireless terminal and the rest of the access network, which may include an Internet Protocol (IP) network, by converting received air-interface frames to IP packets. The base station also coordinates management of attributes for the air interface. 
     Moreover, various aspects or features described herein may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term “article of manufacture” as used herein is intended to encompass a computer program accessible from any computer-readable device, carrier, or media. For example, computer readable media can include but are not limited to magnetic storage devices (e.g., hard disk, floppy disk, magnetic strips . . . ), optical disks (e.g., compact disk (CD), digital versatile disk (DVD) . . . ), smart cards, and flash memory devices (e.g., card, stick, key drive . . . ). 
     Various embodiments will be presented in terms of systems that may include a number of devices, components, modules, and the like. It is to be understood and appreciated that the various systems may include additional devices, components, modules, etc. and/or may not include all of the devices, components, modules etc. discussed in connection with the figures. A combination of these approaches may also be used. 
     Referring now to the drawings,  FIG. 1  is an illustration of a wireless multiple-access communication system  100  in accordance with various aspects. In one example, the wireless multiple-access communication system  100  includes multiple base stations  110  and multiple terminals  120 . Further, one or more base stations  110  can communicate with one or more terminals  120 . By way of non-limiting example, a base station  110  may be an access point, a Node B, and/or another appropriate network entity. Each base station  110  provides communication coverage for a particular geographic area  102   a - c . As used herein and generally in the art, the term “cell” can refer to a base station  110  and/or its coverage area  102  depending on the context in which the term is used. 
     To improve system capacity, the coverage area  102   a  corresponding to a base station  110  may be partitioned into multiple smaller areas (e.g., areas  104   a ,  104   b , and  104   c ). Each of the smaller areas  104   a ,  104   b , and  104   c  may be served by a respective base transceiver subsystem (BTS, not shown). As used herein and generally in the art, the term “sector” can refer to a BTS and/or its coverage area depending on the context in which the term is used. In one example, sectors  104  in a cell  102   a  can be formed by groups of antennas (not shown) at base station  110 , where each group of antennas is responsible for communication with terminals  120  in a portion of the cell  102 . For example, a base station  110  serving cell  102   a  may have a first antenna group corresponding to sector  104   a , a second antenna group corresponding to sector  104   b , and a third antenna group corresponding to sector  104   c . However, it should be appreciated that the various aspects disclosed herein may be used in a system having sectorized and/or unsectorized cells. Further, it should be appreciated that all suitable wireless communication networks having any number of sectorized and/or unsectorized cells are intended to fall within the scope of the hereto appended claims. For simplicity, the term “base station” as used herein may refer both to a station that serves a sector as well as a station that serves a cell. As further used herein, a “serving” access point is one with which a given terminal communicates, and a “neighbor” access point is one with which a given terminal is not in communication. While the following description generally relates to a system in which each terminal communicates with one serving access point for simplicity, it should be appreciated that terminals can communicate with any number of serving access points. 
     In accordance with one aspect, terminals  120  may be dispersed throughout the system  100 . Each terminal  120  may be stationary or mobile. By way of non-limiting example, a terminal  120  may be an access terminal (AT), a mobile station, user equipment, a subscriber station, and/or another appropriate network entity. A terminal  120  may be a wireless device, a cellular phone, a personal digital assistant (PDA), a wireless modem, a handheld device, or another appropriate device. Further, a terminal  120  may communicate with any number of base stations  110  or no base stations  110  at any given moment. 
     In another example, the system  100  can utilize a centralized architecture by employing a system controller  130  that can be coupled to one or more base stations  110  and provide coordination and control for the base stations  110 . In accordance with alternative aspects, system controller  130  may be a single network entity or a collection of network entities. Additionally, the system  100  may utilize a distributed architecture to allow the base stations  110  to communicate with each other as needed. In one example, system controller  130  can additionally contain one or more connections to multiple networks. These networks may include the Internet, other packet based networks, and/or circuit switched voice networks that may provide information to and/or from terminals  120  in communication with one or more base stations  110  in system  100 . In another example, system controller  130  can include or be coupled with a scheduler (not shown) that can schedule transmissions to and/or from terminals  120 . Alternatively, the scheduler may reside in each individual cell  102 , each sector  104 , or a combination thereof. 
     In one example, system  100  may utilize one or more multiple-access schemes, such as CDMA, TDMA, FDMA, OFDMA, Single-Carrier FDMA (SC-FDMA), and/or other suitable multiple-access schemes. TDMA utilizes time division multiplexing (TDM), wherein transmissions for different terminals  120  are orthogonalized by transmitting in different time intervals. FDMA utilizes frequency division multiplexing (FDM), wherein transmissions for different terminals  120  are orthogonalized by transmitting in different frequency subcarriers. In one example, TDMA and FDMA systems can also use code division multiplexing (CDM), wherein transmissions for multiple terminals can be orthogonalized using different orthogonal codes (e.g., Walsh codes) even though they are sent in the same time interval or frequency sub-carrier. OFDMA utilizes Orthogonal Frequency Division Multiplexing (OFDM), and SC-FDMA utilizes Single-Carrier Frequency Division Multiplexing (SC-FDM). OFDM and SC-FDM can partition the system bandwidth into multiple orthogonal subcarriers (e.g., tones, bins, . . . ), each of which may be modulated with data. Typically, modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM. Additionally and/or alternatively, the system bandwidth can be divided into one or more frequency carriers, each of which may contain one or more subcarriers. System  100  may also utilize a combination of multiple-access schemes, such as OFDMA and CDMA. While the power control techniques provided herein are generally described for an OFDMA system, it should be appreciated that the techniques described herein can similarly be applied to any wireless communication system. 
     In another example, base stations  110  and terminals  120  in system  100  can communicate data using one or more data channels and signaling using one or more control channels. Data channels utilized by system  100  can be assigned to active terminals  120  such that each data channel is used by only one terminal at any given time. Alternatively, data channels can be assigned to multiple terminals  120 , which can be superimposed or orthogonally scheduled on a data channel. To conserve system resources, control channels utilized by system  100  can also be shared among multiple terminals  120  using, for example, code division multiplexing. In one example, data channels orthogonally multiplexed only in frequency and time (e.g., data channels not multiplexed using CDM) can be less susceptible to loss in orthogonality due to channel conditions and receiver imperfections than corresponding control channels. 
     In accordance with one aspect, system  100  can employ centralized scheduling via one or more schedulers implemented at, for example, system controller  130  and/or each base station  110 . In a system utilizing centralized scheduling, scheduler(s) can rely on feedback from terminals  120  to make appropriate scheduling decisions. In one example, this feedback can include power amplifier (PA) headroom feedback in order to allow the scheduler to estimate a supportable reverse link peak rate for a terminal  120  from which such feedback is received and to allocate system bandwidth accordingly. 
     In accordance with another aspect, base stations  110  can broadcast or otherwise transmit interference indications to terminals  120 . In one example, a base station  110  can broadcast other sector interference (OSI) messages and/or other similar information corresponding to whether the base station  110  is experiencing excessive interference. This information can be broadcast via a dedicated OSI channel and/or another suitable channel. Once broadcast, OSI messages can then be used by terminals  120  to adjust resources used for transmission on the reverse link. By way of specific example, these resources can include a power spectral density (PSD) parameter that is based on a difference between a data channel PSD, a control channel PSD, and a long-term average path loss difference between a serving base station  120  and one or more of the strongest nearby base stations  120 . In another specific example, reverse link interference control can be used by system  100  to guarantee minimum system stability and quality of service (QoS) parameters for the system. More particularly, decoding error probability of reverse link (RL) acknowledgement messages can be used by system  100  as an error floor for all forward link transmissions. By employing interference control on the RL, system  100  can facilitate power efficient transmission of control and QoS traffic and/or other traffic with stringent error requirements. 
       FIGS. 2A-2B  are block diagrams that illustrate operation of an example system  200  for delta-based power control in a wireless communication system. In one example, system  200  includes a terminal  210  that can communicate with a base station  220  on the forward and reverse links via one or more antennas  216  at terminal  210  and one or more antennas  222  at base station  220 . It should be appreciated that base station  220  can provide coverage for a cell (e.g., a cell  102 ) or an area within a cell (e.g., a sector  104 ). In addition, while only one terminal  210  and base station  220  are illustrated in system  200  for brevity, system  200  can include any number of base stations and/or terminals. For example, system  200  can include one or more neighbor base stations, which can provide coverage for respective geographic areas that can include all, part, or none of an area covered by base station  220 . 
     In accordance with one aspect, a terminal  210  and a base station  220  can communicate to control the amount of transmit power or other resources used by the terminal  210  in communicating with the base station  220  via one or more power control techniques. In one example, terminal  210  can locally conduct power control for communication with base station  220  via a transmission adjustment component  212 . Alternatively, power control techniques can be performed cooperatively between terminal  210  and base station  220 . Example power control techniques that can be performed by terminal  210  and base station  220  are described in further detail infra. 
     In accordance with another aspect, power control techniques utilized by entities in system  200  can additionally take into account interference present in system  200 . For example, in a multiple access wireless communication system, multiple terminals  210  may simultaneously conduct uplink transmission by multiplexing their transmissions to be orthogonal to one another in the time, frequency, and/or code domain. However, complete orthogonality between transmissions from different terminals  210  is often not achieved due to channel conditions, receiver imperfections, and other factors. As a result, terminals  210  in system  200  will often cause interference to other terminals  210  communicating with a common sector. Furthermore, because transmissions from terminals  210  communicating with different sectors are typically not orthogonal to one another, each terminal  210  may also cause interference to terminals  210  communicating with nearby sectors. As a result, the performance of terminals  210  in system  200  can be degraded by the interference caused by other terminals  210  in system  200 . 
     Accordingly, an amount of inter-cell interference caused by a given terminal  210  can be determined by the transmit power level used by the terminal  210  and the location of the terminal  210  relative to neighbor sectors in system  200 . Based on this, power control can be performed in system  200  such that each terminal  210  is allowed to transmit at a power level that is appropriate while keeping intra-cell and inter-cell interference to within acceptable levels. For example, a terminal  210  located closer to its serving base station  220  may be allowed to transmit at a higher power level since the terminal will likely cause less interference to other base stations in system  200 . Conversely, a terminal  210  located farther away from base station  220  and toward the edge of the coverage area of base station  220  may be restricted to a lower transmit power level since the terminal may cause more interference to neighboring base stations. By controlling transmit power in this manner, system  200  can reduce the total interference observed by base stations  220  while allowing “qualified” terminals  210  to achieve higher SNRs and thus higher data rates. 
     Interference-based power control can be performed in system  200  using various techniques in order to increase overall performance of entities therein. In one such technique, transmit Power Spectral Density (PSD) for a data channel, or another suitable channel having a power offset based upon another channel, can be expressed for a given terminal  210  as follows: 
         P   dch ( n )= P   ref ( n )+Δ P ( n ),  (1)
 
     where P dch  (n) is the transmit PSD for the data channel for an update interval n, P ref  (n) is a reference PSD level for update interval n, and ΔP(n) is a transmit PSD delta for update interval n. The PSD levels P dch  (n) and P ref  (n) and the transmit power delta ΔP(n) can be given in units of decibels (e.g., dBm/Hz for P dch  (n) and P ref  (n), and dB for ΔP(n)), although other units can be utilized. Further, it should be appreciated that calculations other than that given by Equation (1) can also be utilized. In one example, the reference PSD level P ref  (n) corresponds to the amount of transmit PSD needed to achieve a target signal-to-noise ratio (SNR) or erasure rate for a designated transmission. The transmission can be provided by a fixed channel such as, for example, a channel quality feedback channel or a request channel. If a reference power level is capable of achieving the corresponding target SNR or erasure rate, then the received SNR for the other channel may be estimated as follows: 
         SNR   dch ( n )= SNR   target   +ΔP ( n ).  (2)
 
     In one example, a data channel and a corresponding control channel utilized by entities in system  200  can have similar interference statistics. This can occur, for example, when control and data channels from different sectors interfere with one another. In such a case, the interference offset for the channels may be calculated at terminal  210 . Alternatively, the interference offset between the control channels and data channels can be broadcasted by one or more base stations  220 . 
     In another example, a transmit PSD for a data channel can be set based on factors such as an amount of inter-sector interference terminal  210  is potentially causing to other terminals in neighboring sectors (e.g., sectors  104 ), an amount of intra-sector interference terminal  210  is potentially causing to other terminals in the same sector, a maximum allowable transmit power level for terminal  210 , a period of time between transmissions by terminal  210 , and/or other factors. 
     With reference to  FIG. 2A , a reverse link (RL) transmission  230  between terminal  210  and base station  220  in system  200  is illustrated. In one example, resources used by terminal  210  for the reverse link transmission, such as power and/or bandwidth, can be adjusted by a transmission adjustment component  212  at terminal  210 . In another example, transmission adjustment component  212  can adjust resources used by terminal  210  for a reverse link transmission by employing one or more power control techniques that can take interference observed by entities in system  200  and/or other factors into account. One example of a power control technique that transmission adjustment component  212  can utilize is a delta-based power control technique, in which the transmit power of terminal  210  can be adjusted based on a delta offset value. By way of specific, non-limiting example, a delta offset value can correspond to a transmit power difference between a pilot channel and a traffic channel utilized by terminal  210  and/or any other suitable metric. 
     In accordance with one aspect, terminal  210  can further include a feedback component  214  to communicate information for power control in the reverse link transmission to base station  220  to facilitate cooperative power control of terminal  210 . For example, feedback component  214  can send a transmit PSD delta computed by transmission adjustment component  212  and a maximum number of subcarriers or subbands that terminal  210  can support at the current transmit PSD delta, N sb,max  (n), to base station  220 . In addition, desired quality of service (QoS) and buffer size parameters can also be transmitted to base station  220  by feedback component  214 . To reduce the amount of required signaling, feedback component  214  can transmit ΔP(n) and N sb,max  (n) at a subset of update intervals via in-band signaling on a data channel and/or by other means. It should be appreciated that a low transmit PSD delta corresponding to terminal  210  does not mean that terminal  210  is not using all of the resources available to it. Instead, terminal  210  can be given more subcarriers or subbands for transmission in order to use all its available transmit power. Further, feedback component  214  can provide information for power control to base station  220  in a variety of ways. For example, such information can be provided to base station  220  via a MAC header of a packet, such as a control channel packet; in a separate physical channel, such as a channel for interference or power control feedback; as part of channel state information feedback (e.g., as one or more bits of channel state information); and/or by other suitable means. 
     In accordance with another aspect, while delta-based power control can be very effective in adjusting the transmit powers of terminal  210  and controlling the amount of interference caused at base stations  220  in system  200  during continuous transmission, it may not provide an initial set point for the transmit power or PSD of terminal  210 . Rather, the initial set point may be a PSD value after a period of inactivity (or a “silence period). If system  200  is partially loaded such that terminal  210  is a single bursty interferer to a neighboring sector, a delta value for terminal  210  may increase to a maximum delta value during any silence period due to the fact that the neighboring sector does not experience any interference during this period and does not transmit indications for large other sector interference. In this case, the bursty transmissions of terminal  210  can cause a significant amount of interference to the neighboring sector at the beginning of each burst, before the delta-based power control finds a chance to adjust the delta value of terminal  210  to an appropriate level. This, in turn, can lead to packet errors or missed reverse link acknowledgement messages in the neighboring sector. Therefore, in one example, transmission adjustment component  212  can be configured to adjust the delta value at the beginning of each burst initiated by terminal  210 . By performing initial adjustments to resources utilized by terminal  210  for transmission, transmission adjustment component  212  can act to limit performance loss due to large increases in interference. 
     In one example, terminal  210  can begin a transmission after a silence period at a minimum delta value and allow transmission adjustment component  212  to adjust the delta value for subsequent transmissions. However, in some instances, such as when terminal  210  transmits bursty traffic with small packets to base station  220 , this may result in an unnecessarily low throughput for the bursty traffic. Alternatively, in order to limit the amount of interference at the beginning of each burst, transmission adjustment component  212  can make open-loop adjustments to the delta value and/or a maximum requested bandwidth value W max . By way of example, transmission adjustment component  212  can determine whether a prior transmission by terminal  210  occurred later than a predetermined threshold, which can be based on a number of frames, superframes, a time period, number of assignment messages, number of erasure measurements, and/or other metrics. If so, transmission adjustment component  212  can then compute an open-loop delta value, an open-loop delta value based on bandwidth assigned for transmission, bandwidth assigned for transmission based on a delta value, and/or other parameters. After computing appropriate parameters, adjustments can be made to bandwidth and/or transmit power used by terminal  210  based on the computation. 
     In one example, transmission adjustment component  212  can be restricted to make open-loop adjustments only at the beginning of each burst, e.g., after it is determined that a threshold has passed. Alternatively, transmission adjustment component  212  may facilitate open-loop adjustments at other times, such as at frames or portions of frames corresponding to interlaces on which terminal  210  is not scheduled, to provide maximum values for a fast delta value to prevent the delta value from becoming too large due to little OSI indication activity. 
     Based on feedback provided to base station  220  by feedback component  214  at terminal  210  as illustrated by  FIG. 2A  and/or other information, base station  220  can generate a resource assignment  240  for terminal  210  and communicate resource assignment  240  to terminal  210  as illustrated in  FIG. 2B . In one example, a transmit power for terminal  210  can be assigned by a power control component  224  at serving sector  220 . Power control component  224  can receive feedback from feedback component  214  at terminal  210 , interference indications from terminal  210  and/or other base stations in system  200 , and/or other parameters for use in generating a resource assignment for terminal  210 . Parameters utilized by power control component  224  can be received together as a common communication or in separate communications. Once a resource assignment  240  is determined by power control component  224 , the assignment can be communicated by base station  220  back to terminal  210 , whereupon transmission adjustment component  212  can adjust transmission resources for terminal  210  in accordance with the assignment. 
     In one specific example, power control component  224  can calculate ΔP(n) and/or other parameters utilized for generating a resource assignment  240  for terminal  210  based upon a reference PSD level P ref  (n), the power of signals received on reverse link channel quality indicator and/or request channels from terminal  210 , and/or other factors. In such an example, carrier-to-interference offset can be determined along with a value for interference minus rise over thermal noise power (IoT−RoT). These values can then be used to offset the power of the signals received from reverse link channel quality indicators and/or request channels from terminal  210  and/or transmitted as power control commands back to terminal  210 . In one example, carrier-to-interference offset can be determined as a function of intra-sector interference and other terminals  210  in a sector served by base station  220 . Further, IoT values can be calculated for base station  220  and/or received from other access points or sectors in system  200  via broadcasts from said access points or sectors and/or via backhaul. Additionally and/or alternatively, RoT values may be calculated by power control component  224  as known. In another example, offsets used by power control component  224  can be based on steps, other variations, and/or system-dependent delta factors. 
     In another example, total interference power received over the bandwidth of system  200  can be used by power control component  224  as an interference control metric. The total interference power can be used to determine a maximum per-user interference target, which can then be used to schedule terminal  210  for reverse link transmission in terms of bandwidth, timing, and/or other parameters. The per-user interference target can be set, for example, to be a small fraction of total interference power for systems with interference vulnerable deployment. By way of non-limiting example, such a target can be utilized in a micro cell deployment since an individual terminal on a cell edge in such a deployment may have enough power to overwhelm a cell over a bandwidth of 5 or 10 MHz. In addition, such a target can be utilized in connection with cells used for communicating traffic having a significantly low latency that is susceptible to large IoT variations. 
     In accordance with another aspect, a resource assignment  240  determined by power control component  224  and received by terminal  210  may not match open-loop requirements for terminal  210  computed by transmission adjustment component  212 . For example, an assigned bandwidth may be too large for use by terminal  210  based on a maximum bandwidth corresponding to minimum delta values computed by transmission adjustment component  212 . In such a case, transmission adjustment component  212  can recover from an assignment mismatch in various ways. For example, transmission adjustment component  212  can instruct terminal  210  to suspend transmission and lose the assignment received from base station  220 . As another example, the minimum delta value can be utilized by transmission adjustment component  212  to determine a new maximum bandwidth and/or delta value, which can then be communicated to base station  220  in order to receive a new assignment. Additionally and/or alternatively, if terminal  210  is capable of reverse rate indication (RRI) and/or multiple hypothesis decoding, terminal  210  can change a packet format used for communication with base station  220  in order to effectively utilize the resource assignment. As an additional example, transmission adjustment component  212  can discard the resource assignment and instruct terminal  210  to either suspend transmission or to extend a hybrid automatic request (HARQ) retransmission to account for the discarded assignment. 
       FIGS. 3A-3B  are block diagrams that illustrate operation of an example system  300  for reverse link power control and interference management in a wireless communication system. In one example, system  300  includes a terminal  310  in communication with a serving sector  320  on the forward and reverse links via respective antennas  316  and  322 . System  300  can also include one or more neighbor sectors  330  not in direct communication with terminal  310 . For example, neighbor sector  330  can provide coverage for a geographic area bordering an area for which serving sector  320  provides coverage. While only one terminal  310  and two sectors  320  and  330  are illustrated in system  300 , it should be appreciated that system  300  can include any number of terminals and/or sectors. 
     In accordance with one aspect, terminal  310  can utilize one or more delta-based power control algorithms to control resources used by terminal  310  for communication with serving sector  320  on the reverse link. Terminal  310  can employ such techniques independently, or alternatively terminal  310  can perform delta-based power control in cooperation with serving sector  320 . In one example, power control techniques utilized by terminal  310  and serving sector  320  can be based on a level of interference caused by terminal  310  at serving sector  320  and/or other sectors such as neighbor sector  330 . By utilizing interference as a factor in power control for terminal  310 , such techniques can facilitate more optimal overall performance in system  300  than similar techniques that do not take interference into account. 
     With reference to  FIG. 3A , a reverse link transmission  314  from terminal  310  to serving sector  320  and a subsequent other sector interference (OSI) indication  318  from neighbor sector  330  is illustrated. In accordance with one aspect, in the event that dominant interference sector  330  experiences interference subsequent to a reverse link transmission from terminal  310 , dominant interference sector  330  can transmit one or more OSI indications  318  to terminal  310  on the forward link via one or more antennas  332 . Terminal  310  can utilize OSI indications  318  received from dominant interference sector  330  to determine an amount of inter-sector interference terminal  310  is potentially causing in various manners. In one example, the amount of inter-sector interference caused by terminal  310  can be directly estimated at dominant interference sector  330  and/or other neighbor access points in system  300 . These directly estimated values can then be sent to terminal  310  in order to allow terminal  310  to adjust its transmit power accordingly. 
     Alternatively, the amount of inter-sector interference caused by terminal  310  can be roughly estimated based on the total interference observed by dominant interference sector  330  and/or neighbor access points; channel gains for serving sector  320 , dominant interference sector  330 , and/or neighbor access points; and/or a transmit power level used by terminal  310 . In one example, respective access points in system  300  can estimate a total or average currently observed amount of interference and broadcast these interference measurements for use by terminals in other sectors. By way of non-limiting example, a single other-sector interference (OSI) bit can be used by each access point to provide interference information. Accordingly, each access point may set its OSI bit (OSIB) as follows: 
     
       
         
           
             
               
                 
                   
                     OSIB 
                      
                     
                       ( 
                       N 
                       ) 
                     
                   
                   = 
                   
                     { 
                     
                       
                         
                           
                             
                               1 
                                 
                               ′ 
                                 
                                 
                               ′ 
                             
                             , 
                             
                               
                                 if 
                                  
                                 
                                     
                                 
                                  
                                 
                                   
                                     IOT 
                                     
                                       meas 
                                       , 
                                       m 
                                     
                                   
                                    
                                   
                                     ( 
                                     n 
                                     ) 
                                   
                                 
                               
                               ≥ 
                               
                                 IOT 
                                 target 
                               
                             
                             , 
                             and 
                           
                         
                       
                       
                         
                           
                             
                               0 
                                 
                               ′ 
                                 
                                 
                               ′ 
                             
                             , 
                             
                               
                                 if 
                                  
                                 
                                     
                                 
                                  
                                 
                                   
                                     IOT 
                                     
                                       meas 
                                       , 
                                       m 
                                     
                                   
                                    
                                   
                                     ( 
                                     n 
                                     ) 
                                   
                                 
                               
                               &lt; 
                               
                                 IOT 
                                 target 
                               
                             
                             , 
                           
                         
                       
                     
                   
                 
               
               
                 
                   ( 
                   3 
                   ) 
                 
               
             
           
         
       
     
     where IOT meas,m  (n) is the measured interference-over-thermal (IOT) value for an m-th sector at a time interval n and IOT target  is a desired operating point for the sector. As used in Equation (3), IOT refers to a ratio of the total interference power observed by an access point to thermal noise power. Based on this, a specific operating point may be selected for the system and denoted as IOT target . In one example, OSI can be quantized into multiple levels and accordingly comprise multiple bits. For example, an OSI indication can have two levels, such as IOT MIN  and IOT MAX . The levels can be configured such that, for example, if an observed IOT is between IOT MIN  and IOT MAX , then a terminal  310  can continue to use its current transmit power without adjustment. Alternatively, if the observed IOT is above or below the given levels, then transmit power can be accordingly adjusted upward or downward. 
     OSI indications  318  can be communicated by dominant interference sector in various manners. For example, OSI indications  318  communicated by dominant interference sector  330  can be regular OSI indications carried over forward link physical channels, such as a forward link OSI channel (F-OSICH). Regular OSI indications can be rate-limited to, for example, one transmission per superframe to account for required power and time-frequency resources of such indications. As another example, OSI indications  318  communicated by dominant interference sector  330  can be fast OSI indications carried over a forward link fast OSI channel (F-FOSICH) and/or another appropriate channel. Such indications can be used, for example, in scenarios where bursty traffic is transmitted by terminal  310  in order to enable more dynamic control of power levels. Additionally, OSI indications  318  communicated by dominant interference sector  330  can include indications of traffic interference over thermal noise power (IOT) and/or other interference offset parameters observed by dominant interference sector  330 , which can be carried over a forward link physical channel such as a forward link IOT channel (F-IOTCH). 
     In accordance with another aspect, terminal  310  can additionally estimate channel gain or propagation path gain for access points that may receive a reverse link transmission  314  from terminal  310 . The channel gain for each of the access points can be estimated by processing a pilot received from the access points on the forward link. In one example, a channel gain ratio between serving sector  320  and a neighbor access point such as dominant interference sector  330  can be utilized as a “relative distance” indicative of a distance to dominant interference sector  330  relative to a distance to serving sector  320 . It can be observed that a channel gain ratio for a neighbor access point will generally decrease as terminal  310  moves toward a sector edge corresponding to serving sector  320  and generally increase as terminal  310  moves closer to serving sector  320 . In addition, information regarding pilot carrier power over thermal noise power (pCoT) and/or other channel quality parameters can be communicated by sectors  320  and/or  330  to terminal  310  through a forward link pilot quality indicator channel (F-PQICH) and/or another suitable forward link physical channel. 
     Based on the presence or absence of an OSI indication from dominant interference sector  330  indicating interference caused by terminal  310  from a reverse link transmission to serving sector  320  as illustrated in  FIG. 3A , terminal  310  can perform delta-based adjustments to resources utilized for the reverse link transmission and repeat the transmission with the adjusted resources as illustrated in  FIG. 3B . In one example, terminal  310  can include a transmission adjustment component  312  for adjusting transmit power, bandwidth, and/or resources used for reverse link communication with serving sector  320 . While transmission adjustment component  312  is illustrated in  FIG. 3B  as a component of terminal  310 , it should be appreciated that serving sector  320  and/or another suitable network entity can also perform some or all of the calculations performed by transmission adjustment component  312  either independently of or in cooperation with terminal  310 . 
     In accordance with one aspect, terminal  310  can monitor OSI bits broadcast by neighbor access points in system  300  and can be configured to only respond to an OSI bit of a dominant interference sector  330 , which can have the smallest channel gain ratio of the neighbor access points. In one example, if the OSI bit of dominant interference sector  330  is set to ‘1,’ due to, for example, dominant interference sector  330  observing higher than nominal inter-sector interference, then transmission adjustment component  312  can accordingly adjust the reverse link transmission resources utilized by terminal  310  downward and instruct retransmission of the most recent reverse link transmission to serving sector  320 . Conversely, if the OSI bit of dominant interference sector  330  is set to ‘0,’ transmission adjustment component  312  can adjust the reverse link transmission resources of terminal  310  upward. Alternatively, transmission adjustment component  312  can utilize OSI bits from more than one access point and can utilize various algorithms to adjust the reverse link transmission resources of terminal  310  and to initiate reverse link retransmissions  324  based on the multiple received OSI bits. 
     In accordance with another aspect, reverse link transmit power and/or other resources utilized by terminal  310  can be adjusted by transmission adjustment component  312  based on fast OSI indications received from dominant interference sector  330  utilizing a power metric computed by transmission adjustment component  312 . For example, if transmission of a packet by terminal  310  causes interference at dominant interference sector  330 , dominant interference sector  330  can indicate to terminal  310  to lower the transmit power used for retransmission of the packet. This can be done, for example, by interlacing an OSI indication to terminal  310  as illustrated in  FIG. 3A  with the transmission of the packet associated with the OSI indication. 
     Transmissions, adjustments, and subsequent retransmissions of packets on the reverse link by terminal  310  in system  300  based on OSI indications from dominant interference sector  330  can proceed as illustrated by timeline  400  in  FIG. 4 . In accordance with one aspect, transmission adjustment component  312  can perform adjustments to resources utilized by terminal  310  before retransmission of the packet that caused the OSI upon receiving an OSI indication. For example, as illustrated by timeline  400 , a first reverse link transmission can be conducted at interlace  401 , and an OSI indication corresponding to the transmission can be received at interlace  403 . Based on the OSI indication, a resource adjustment can be performed at interlace  404  for retransmission of the first packet at interlace  410 . Similarly, a second reverse link transmission can be conducted at interlace  402 , and a second resource adjustment can be performed at interlace  408  based on an OSI indication corresponding to the second transmission received at interlace  405 . An OSI indication can also be received on a common interlace with a reverse link transmission, as illustrated by the third reverse link transmission at interlace  405 . An OSI indication for the third transmission may also be received, as indicated at interlace  407 . A retransmission for a given packet can occur eight interlaces after the initial transmission, as illustrated by interlaces  401  and  410  in timeline  400 , or alternatively retransmission can occur at any other appropriate uniform or non-uniform interval following an initial transmission. 
     In one example, the transmit power for retransmission of a packet can be determined by determining whether an original transmission caused an OSI indication and requires an adjustment. If so, terminal  310  can check for other adjustments that have been made within a predetermined number of interlaces, select the lowest of the adjusted power values that was noted to have caused an OSI indication, and step the lowest such power value down by a delta offset value. Alternatively, if it is determined that the original transmission did not cause an OSI indication, terminal  310  can check for other adjustments that have been made within a predetermined number of interlaces, select the highest of the adjusted power values that was noted not to have caused an OSI indication, and step the highest such power value up by a delta offset value. In another example, the delta values and/or power metrics used to adjust transmission resources can be predetermined or calculated using one or more techniques as described infra. 
     In another example, a new assignment for transmission resources for terminal  310  may arrive from serving sector  320  and/or another appropriate entity in system  300  during any interlace on timeline  400 . The new assignment can comprise, for example, a delta value that provides PSD based on adjustments of previous interlaces. Based on the new assignment, terminal  310  can report a power metric used by terminal  310  to adjust transmission resources to serving sector  320  at the start of a following reverse link transmission in order to allow serving sector  320  to utilize the power metric in new assignments for terminal  310 . In one example, if it is determined by serving sector  320  that OSI exists based on a report from terminal  310 , serving sector  320  can step down the transmit power utilized by terminal  310  in a subsequent assignment. 
     Referring to  FIGS. 5-7 , methodologies for delta-based power control and interference management in a wireless communication system are illustrated. While, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more embodiments, occur in different orders and/or concurrently with other acts from that shown and described herein. For example, those skilled in the art will understand and appreciate that a methodology could alternatively be represented as a series of interrelated states or events, such as in a state diagram. Moreover, not all illustrated acts may be required to implement a methodology in accordance with one or more embodiments. 
     With reference to  FIG. 5 , illustrated is a methodology  500  for adjusting reverse link transmission resources in a wireless communication system (e.g., system  200 ). It is to be appreciated that methodology  500  can be performed by, for example, a terminal (e.g., terminal  210 ) and/or any other appropriate network entity. Methodology  500  begins at block  502 , wherein a reverse link transmission to a serving sector (e.g., base station  220 ) is conducted. Next, at block  504 , it is determined whether the reverse link transmission conducted at  502  occurred after a predetermined threshold. The threshold can be based on, for example, a number of frames or superframes, a time period, a number of assignment messages, a number of erasure measurements, and/or other metrics. 
     If it is determined at block  504  that the transmission conducted at block  502  did not occur after the threshold, methodology  500  concludes. Otherwise, methodology  500  proceeds to block  506 , wherein one or more of an open-loop delta value, an open-loop delta value based on an assigned bandwidth, and a bandwidth based on a delta value are computed. In one example, open loop adjustments performed at block  506  can be restricted to the beginning of respective transmission bursts, such as after the threshold utilized in block  504  has passed. Alternatively, open loop projections can be computed at block  506  on interlaces on which an entity performing methodology  500  is not scheduled in order to determine a maximum value for a fast delta value to prevent the delta value from becoming too large due to little OSI indication activity. 
     In accordance with one aspect, computations of an open-loop delta value, an open-loop delta value based upon bandwidth assigned for transmission, and/or a bandwidth assigned for transmission based upon a delta value that can be performed at block  506  can proceed as described in the following non-limiting examples. In one example, to compute an open-loop delta value at block  506  to control a maximum PSD rise, a delta value can be calculated such that 
       ( IoT   avg   +pCoT ×Δ)/ IoT   avg   &lt;IoT Rise max .  (4)
 
     As used in Equation (2), IoT avg  is an interference offset value that can be provided as a system parameter; for example, it can be broadcast by the non-serving sector for which the open-loop adjustment at block  506  is being calculated and/or from a sector having the smallest channel gain difference with a serving sector. In one example, IoT avg  can be set to a fixed value for simplicity of system design and/or to reduce the amount of feedback required for power control. In such an example, IoT avg  can be set to a conservative value (e.g., 1, thereby assuming no current interference other than thermal noise), a nominal IoT value such as IoT target , and/or another appropriate value. Further, pCoT corresponds to a measurement of received signal power (e.g., received carrier PSD over thermal PSD) on a reference channel (e.g., a reverse link pilot channel, channel quality indicator channel, and/or any other reference channel) at a non-serving sector. The value of pCoT can be communicated over a dedicated forward link channel, such as a forward link pilot quality channel (F-PQICH), communicated from a non-serving sector, obtained by appropriately adjusting corresponding parameters for the serving sector using channel gain difference values, and/or by other means. In addition, IoTRise max  indicates a maximum allowable rise in an amount of interference caused by any access terminal at a non-serving sector. The value of IoTRise max  can be a system configuration or overhead provided value. 
     In another example, in the event that a delta value computed using the above technique is smaller than a minimum delta value (Δ min ) a maximum supportable bandwidth, W max , can be allocated down by a predetermined amount or based on the following: 
       ( IoT   avg   +W   max   /W   tot   ×pCoT×Δ   min )/ IoT   avg   &lt;IoT Rise max .  (5)
 
     where W tot  is the total system bandwidth. 
     In an additional example, an open-loop delta can be computed at block  506  to control an average PSD rise based on an assigned bandwidth W as follows: 
       ( IoT   avg   +W/W   tot   ×pCoT ×Δ)/ IoT   avg   &lt;IoT Rise max .  (6)
 
     Further, as additional information to aid the serving sector in assigning W, a maximum supportable bandwidth, W max , can also be computed based on the minimum delta value (Δ min ) such that 
       ( IoT   avg   +W   max   /W   tot   ×pCoT×Δ   min )/ IoT   avg   &lt;IoT Rise max   (7)
 
     and communicated to the serving sector prior to assignment. 
     In a further example, the amount of interference at the beginning of each transmission burst can also be controlled at block  506  by limiting an initial maximum supportable bandwidth based on a current delta value and controlling the average PSD rise. In this case a maximum supportable bandwidth (W max ) value can be calculated such that 
       ( IoT   avg   +W   max   /W   tot   ×pCoT ×Δ)/ IoT   avg   &lt;IoT Rise max .  (8)
 
     and communicated to the serving access point. The serving access point can then gradually increase assigned bandwidth over subsequent assignments to allow enough time for fast OSI indications to adjust the delta value. 
     In accordance with another aspect, the serving sector can utilize data carrier to interference (DataCtoI) values for assigning resources to an entity performing methodology  500  while a corresponding delta value can be utilized by the entity performing methodology  500 . In addition, each packet format can have an associated DataCtoI min  and/or Δ min  value. In one example, a lookup table can be maintained that includes a DataCtoI min  to be utilized. Further, an index into the lookup table can be provided at block  506  for each packet format to allow an entity performing methodology  500  and/or the serving sector to associate with a DataCtoI min  value and/or a Δ min  for the packet format. 
     Upon completing the calculations at block  506 , methodology  500  concludes at block  508 , wherein bandwidth and/or transmit power is adjusted (e.g., by a transmission adjustment component  312 ) based at least in part on the computation performed at block  506 . In accordance with one aspect, a first delta value (e.g., Δ slow ) can be computed at block  506  based on slow OSI indications from a neighboring access point. The first delta value can be used as a maximum value for other parameters computed at block  506  and/or as feedback to the serving sector separately or in combination with power headroom, interference reports, and/or other feedback for future resource assignments. In one example, a second delta value (e.g., Δ tx ) can additionally be computed at block  506  and utilized for adjustments to transmit power and/or bandwidth at block  508 . 
     In accordance with another aspect, resource adjustments at block  508  can be made based on a value of Δ tx  as follows. First, for each interlace i, a power metric PM i  can be defined as a product of a received CoT value from the serving sector and an assigned bandwidth on the interlace, e.g., PM i =CoT i ×BW i . Maximum and minimum power metrics can then be calculated for each interlace as follows: 
     
       
         
           
             
               
                 
                   
                     
                       PM 
                       
                         
                           m 
                            
                           
                               
                           
                            
                           i 
                            
                           
                               
                           
                            
                           n 
                         
                         , 
                         i 
                       
                     
                     = 
                     
                       
                         min 
                         
                           
                             
                               j 
                               = 
                               
                                 i 
                                 - 
                                 numInterlaces 
                               
                             
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                             … 
                              
                             
                                 
                             
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                                 j 
                               
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                               0 
                             
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                                    
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                                 j 
                               
                               = 
                               1 
                             
                           
                         
                       
                        
                       
                         PM 
                         j 
                       
                     
                   
                    
                   
                     
 
                   
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                            
                           
                               
                           
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                         , 
                         i 
                       
                     
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                                 - 
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                             … 
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                             , 
                             
                               i 
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                                 PM 
                                 j 
                               
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                               0 
                             
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                                 OSI 
                                 j 
                               
                               = 
                               0 
                             
                           
                         
                       
                        
                       
                         
                           PM 
                           j 
                         
                         . 
                       
                     
                   
                 
               
               
                 
                   ( 
                   9 
                   ) 
                 
               
             
           
         
       
     
     Based on these values, a power metric for interlace i can then be set as follows: 
     
       
         
           
             
               
                 
                   
                     PM 
                     i 
                   
                   = 
                   
                     { 
                     
                       
                         
                           
                             
                               PM 
                               
                                 
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                                   n 
                                 
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                             - 
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                               OSI 
                               
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                             = 
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                   ( 
                   10 
                   ) 
                 
               
             
           
         
       
     
     subject to the constraint 
       Δ min,i ≦Δ tx,i ≦Δ assigned,i*   (11)
 
     Additionally and/or alternatively, a transmit PSD utilized for reverse link data communication on a physical channel (e.g., R-DCH) can be adjusted at block  508  based on an assignment from the serving sector as follows: 
         PSD   R-DCH   =PSD   R-PICH +Δ tx +AttemptBoost j ,  (12)
 
     where j is a sub-packet index and AttemptBoost j  is a power boost parameter assigned by the serving sector. 
     In accordance with a further aspect, data channels utilized by each sector in system  300  can be multiplexed such that they are orthogonal to one another. However, despite such multiplexing, some loss in orthogonality can result from inter-carrier interference (ICI), inter-symbol interference (ISI), and/or other causes, from which intra-sector interference can result. To mitigate intra-sector interference, the transmit PSD of terminal  310  may be controlled by transmission adjustment component  312  such that the amount of intra-sector interference that terminal  310  may cause to other terminals in the same sector is maintained within an acceptable level. This may be achieved, for example, by constraining the transmit PSD delta, ΔP(n), to be within a corresponding range ΔP(n)ε[ΔP min , ΔP max ], where ΔP min  and ΔP max  are respectively the minimum and maximum transmit PSD deltas allowable for a given data channel. 
       FIG. 6  illustrates a methodology  600  for adjusting reverse link transmission resources to reduce interference in a wireless communication system (e.g., system  300 ). It is to be appreciated that methodology  600  can be performed by, for example, a terminal (e.g., terminal  310 ) and/or any other appropriate network entity in a wireless communication system. Methodology  600  begins at blocks  602 , wherein a reverse link transmission to a serving sector (e.g., serving sector  320 ) is conducted. Next, at block  604 , it is determined whether an OSI indication is received (e.g., from dominant interference sector  300 ). In one example, if transmission of a packet by an entity performing methodology  600  causes interference at a neighboring sector, that sector can transmit an OSI indication to request that transmit power used for a subsequent retransmission be lowered. This can be done, for example, by interlacing the OSI indication with the transmission at block  602 . 
     If an OSI indication is received at block  604 , methodology  600  can proceed to block  606 , wherein a lowest transmit power value used within a predetermined period of time that caused an OSI is selected. In one example, an entity performing methodology  600  can check for other adjustments that have been made within a predetermined number of interlaces or another predetermined time period and select the lowest of the adjusted power values that was noted to have caused an OSI indication. Methodology  600  can then conclude at block  608 , wherein transmit power (e.g., transmit power used for retransmission of the transmission conducted at block  602 ) is adjusted by subtracting a delta offset value from the transmit power value selected at block  606 . 
     Alternatively, if an OSI indication is not received at block  604 , methodology  600  can instead proceed to block  610 , wherein a highest transmit power used within a predetermined period of time that did not cause an OSI is selected. In one example, an entity performing methodology  600  can check for other adjustments that have been made within a predetermined number of interlaces or another predetermined time period and select the highest of the adjusted power values that was noted not to have caused an OSI indication. Methodology  600  can then conclude at block  612 , wherein transmit power (e.g., transmit power used for retransmission of the transmission conducted at block  602 ) is adjusted by adding a delta offset value from the transmit power value selected at block  610 . 
       FIG. 7  illustrates a methodology  700  for conducting reverse link power control and interference management in a wireless communication system (e.g., system  200 ). It is to be appreciated that methodology  700  can be performed by, for example, an access point (e.g., base station  220 ) and/or any other suitable network entity in a wireless communication system. Methodology  700  begins at block  702 , wherein a communication request and/or power control feedback information is received from a terminal (e.g., terminal  210 ). Methodology  700  then proceeds to block  704 , wherein a report of OSI activity caused by the terminal is received. In one example, information received at blocks  702  and  704  can be received together in a common communication or in separate communications. Additionally, the report received at block  704  can be communicated to an entity performing methodology  700  by the terminal or by another appropriate entity in the system (e.g., a neighboring base station). 
     Next, at block  706 , one or more of a transmit power or a bandwidth for the terminal can be assigned (e.g., by a power control component  224 ) based on the received information at blocks  702  and  704 . In one specific example, ΔP(n) and/or other parameters utilized for generating a resource assignment for a terminal can be computed at block  706  based on a reference PSD level P ref  (n), the power of signals received on reverse link channel quality indicator and/or request channels from the terminal, and/or other factors. In such an example, carrier-to-interference offset can be determined along with a value for interference minus rise over thermal noise power, and these values can be used to offset the power of signals received on the reverse link from the terminal and/or transmitted as power control commands at block  708 . In one example, carrier-to-interference offset can be determined as a function of intra-sector interference and other terminals in a given sector. Further, IoT values can be calculated at block  706  and/or received from other access points or sectors. Additionally and/or alternatively, RoT values may be calculated at block  706  as known. In another example, offsets used at block  706  can be based on steps, other variations, and/or system-dependent delta factors. Upon completing the assignments at block  706 , methodology concludes at block  708 , wherein the assigned transmit power and/or bandwidth is communicated to the terminal. 
     Referring now to  FIG. 8 , a block diagram illustrating an example wireless communication system  800  in which one or more embodiments described herein may function is provided. In one example, system  800  is a multiple-input multiple-output (MIMO) system that includes a transmitter system  810  and a receiver system  850 . It should be appreciated, however, that transmitter system  810  and/or receiver system  850  could also be applied to a multi-input single-output system wherein, for example, multiple transmit antennas (e.g., on a base station), may transmit one or more symbol streams to a single antenna device (e.g., a mobile station). Additionally, it should be appreciated that aspects of transmitter system  810  and/or receiver system  850  described herein could be utilized in connection with a single output to single input antenna system. 
     In accordance with one aspect, traffic data for a number of data streams are provided at transmitter system  810  from a data source  812  to a transmit (TX) data processor  814 . In one example, each data stream can then be transmitted via a respective transmit antenna  824 . Additionally, TX data processor  814  can format, code, and interleave traffic data for each data stream based on a particular coding scheme selected for each respective data stream in order to provide coded data. In one example, the coded data for each data stream may then be multiplexed with pilot data using OFDM techniques. The pilot data can be, for example, a known data pattern that is processed in a known manner. Further, the pilot data may be used at receiver system  850  to estimate channel response. Back at transmitter system  810 , the multiplexed pilot and coded data for each data stream can be modulated (i.e., symbol mapped) based on a particular modulation scheme (e.g., BPSK, QSPK, M-PSK, or M-QAM) selected for each respective data stream in order to provide modulation symbols. In one example, data rate, coding, and modulation for each data stream may be determined by instructions performed on and/or provided by processor  830 . 
     Next, modulation symbols for all data streams can be provided to a TX processor  820 , which may further process the modulation symbols (e.g., for OFDM). TX MIMO processor  820  may then provides N T  modulation symbol streams to N T  transmitters (TMTR)  822   a  through  822   t . In one example, each transmitter  822  can receive and process a respective symbol stream to provide one or more analog signals. Each transmitter  822  may then further condition (e.g., amplify, filter, and upconvert) the analog signals to provide a modulated signal suitable for transmission over a MIMO channel. Accordingly, N T  modulated signals from transmitters  822   a  through  822   t  can then be transmitted from N T  antennas  824   a  through  824   t , respectively. 
     In accordance with another aspect, the transmitted modulated signals can be received at receiver system  850  by N R  antennas  852   a  through  852   r . The received signal from each antenna  852  can then be provided to a respective receiver (RCVR)  854 . In one example, each receiver  854  can condition (e.g., filter, amplify, and downconvert) a respective received signal, digitize the conditioned signal to provide samples, and then processes the samples to provide a corresponding “received” symbol stream. An RX MIMO/data processor  860  can then receive and process the N R  received symbol streams from N R  receivers  854  based on a particular receiver processing technique to provide N T  “detected” symbol streams. In one example, each detected symbol stream can include symbols that are estimates of the modulation symbols transmitted for the corresponding data stream. RX processor  860  can then process each symbol stream at least in part by demodulating, deinterleaving, and decoding each detected symbol stream to recover traffic data for a corresponding data stream. Thus, the processing by RX processor  860  may be complementary to that performed by TX MIMO processor  820  and TX data processor  814  at transmitter system  810 . RX processor  860  may additionally provide processed symbol streams to a data sink  864 . 
     In accordance with one aspect, the channel response estimate generated by RX processor  860  may be used to perform space/time processing at the receiver, adjust power levels, change modulation rates or schemes, and/or other appropriate actions. Additionally, RX processor  860  may further estimate channel characteristics such as, for example, signal-to-noise-and-interference ratios (SNRs) of the detected symbol streams. RX processor  860  can then provide estimated channel characteristics to a processor  870 . In one example, RX processor  860  and/or processor  870  can further derive an estimate of the “operating” SNR for the system. Processor  870  can then provide channel state information (CSI), which may comprise information regarding the communication link and/or the received data stream. This information may include, for example, the operating SNR. The CSI can then be processed by a TX data processor  818 , modulated by a modulator  880 , conditioned by transmitters  854   a  through  854   r , and transmitted back to transmitter system  810 . In addition, a data source  816  at receiver system  850  may provide additional data to be processed by TX data processor  818 . 
     Back at transmitter system  810 , the modulated signals from receiver system  850  can then be received by antennas  824 , conditioned by receivers  822 , demodulated by a demodulator  840 , and processed by a RX data processor  842  to recover the CSI reported by receiver system  850 . In one example, the reported CSI can then be provided to processor  830  and used to determine data rates as well as coding and modulation schemes to be used for one or more data streams. The determined coding and modulation schemes can then be provided to transmitters  822  for quantization and/or use in later transmissions to receiver system  850 . Additionally and/or alternatively, the reported CSI can be used by processor  830  to generate various controls for TX data processor  814  and TX MIMO processor  820 . In another example, CSI and/or other information processed by RX data processor  842  can be provided to a data sink  844 . 
     In one example, processor  830  at transmitter system  810  and processor  870  at receiver system  850  direct operation at their respective systems. Additionally, memory  832  at transmitter system  810  and memory  872  at receiver system  850  can provide storage for program codes and data used by processors  830  and  870 , respectively. Further, at receiver system  850 , various processing techniques may be used to process the N R  received signals to detect the N T  transmitted symbol streams. These receiver processing techniques can include spatial and space-time receiver processing techniques, which may also be referred to as equalization techniques, and/or “successive nulling/equalization and interference cancellation” receiver processing techniques, which may also be referred to as “successive interference cancellation” or “successive cancellation” receiver processing techniques. 
       FIG. 9  is a block diagram of a system  900  that facilitates reverse link power control in a wireless communication system in accordance with various aspects. In one example, system  900  includes an access terminal  902 . As illustrated, access terminal  902  can receive signal(s) from one or more access points  904  and transmit to the one or more access points  904  via an antenna  908 . Additionally, access terminal  902  can comprise a receiver  910  that receives information from antenna  908 . In one example, receiver  910  can be operatively associated with a demodulator (Demod)  912  that demodulates received information. Demodulated symbols can then be analyzed by a processor  914 . Processor  914  can be coupled to memory  916 , which can store data and/or program codes related to access terminal  902 . Additionally, access terminal  902  can employ processor  914  to perform methodologies  500 ,  600 , and/or other appropriate methodologies. Access terminal  902  can also include a modulator  918  that can multiplex a signal for transmission by a transmitter  920  via antenna  908  to one or more access points  904 . 
       FIG. 10  is a block diagram of a system  1000  that coordinates reverse link power control and interference management in a wireless communication system in accordance with various aspects described herein. In one example, system  1000  includes a base station or access point  1002 . As illustrated, access point  1002  can receive signal(s) from one or more access terminals  1004  via a receive (Rx) antenna  1006  and transmit to the one or more access terminals  1004  via a transmit (Tx) antenna  1008 . 
     Additionally, access point  1002  can comprise a receiver  1010  that receives information from receive antenna  1006 . In one example, the receiver  1010  can be operatively associated with a demodulator (Demod)  1012  that demodulates received information. Demodulated symbols can then be analyzed by a processor  1014 . Processor  1014  can be coupled to memory  1016 , which can store information related to code clusters, access terminal assignments, lookup tables related thereto, unique scrambling sequences, and/or other suitable types of information. In one example, access point  1002  can employ processor  1014  to perform methodology  700  and/or other appropriate methodologies. Access point  1002  can also include a modulator  1018  that can multiplex a signal for transmission by a transmitter  1020  through transmit antenna  1008  to one or more access terminals  1004 . 
       FIG. 11  illustrates an apparatus  1100  that facilitates initial transmission resource adjustments in a wireless communication system (e.g., system  200 ). It is to be appreciated that apparatus  1100  is represented as including functional blocks, which can be functional blocks that represent functions implemented by a processor, software, or combination thereof (e.g., firmware). Apparatus  1100  can be implemented in a terminal (e.g., terminal  210 ) and/or another suitable network entity and can include a module for conducting a reverse link transmission to a serving sector  1102 . Further, apparatus  1100  can include a module for determining whether the transmission occurred outside of a timing threshold  1104 . Apparatus can also include a module for computing an open loop delta value, an open loop delta value based on an assigned bandwidth, and/or a bandwidth based on a delta value upon a positive determination  1106 . In addition, apparatus  1100  can include a module for adjusting bandwidth and/or transmit power to computed values upon a positive determination  1108 . 
       FIG. 12  illustrates an apparatus  1200  that facilitates adjusting reverse link transmission resources for interference control in a wireless communication system. It is to be appreciated that apparatus  1200  is represented as including functional blocks, which can be functional blocks that represent functions implemented by a processor, software, or combination thereof (e.g., firmware). Apparatus  1200  can be implemented in a terminal and/or another suitable network entity and can include a module for conducting a reverse link transmission to a serving sector  1202 . Further, apparatus  1200  can include a module for determining whether an OSI indication has been received  1204  and a module for adjusting transmit power and/or bandwidth based at least in part on the determination  1206 . 
       FIG. 13  illustrates an apparatus  1300  that facilitates reverse link power control and interference management in a wireless communication system. It is to be appreciated that apparatus  1300  is represented as including functional blocks, which can be functional blocks that represent functions implemented by a processor, software, or combination thereof (e.g., firmware). Apparatus  1300  can be implemented in an access point (e.g., base station  220 ) and/or another suitable network entity in a wireless communication system and can include a module for receiving a request and/or power control feedback from a terminal  1302 . Further, apparatus  1300  can include a module for receiving a report of OSI activity caused by the terminal  1304 , a module for assigning resources for communication with the terminal based on the received information  1306 , and a module for communicating the assigned communication resources to the terminal  1308 . 
     It is to be understood that the embodiments described herein may be implemented by hardware, software, firmware, middleware, microcode, or any combination thereof. When the systems and/or methods are implemented in software, firmware, middleware or microcode, program code or code segments, they may be stored in a machine-readable medium, such as a storage component. A code segment may represent a procedure, a function, a subprogram, a program, a routine, a subroutine, a module, a software package, a class, or any combination of instructions, data structures, or program statements. A code segment may be coupled to another code segment or a hardware circuit by passing and/or receiving information, data, arguments, parameters, or memory contents. Information, arguments, parameters, data, etc. may be passed, forwarded, or transmitted using any suitable means including memory sharing, message passing, token passing, network transmission, etc. 
     For a software implementation, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The software codes may be stored in memory units and executed by processors. The memory unit may be implemented within the processor or external to the processor, in which case it can be communicatively coupled to the processor via various means as is known in the art. 
     What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the described embodiments are intended to embrace all such alterations, modifications and variations that fall within the spirit and scope of the appended claims. Furthermore, to the extent that the term “includes” is used in either the detailed description or the claims, such term is intended to be inclusive in a manner similar to the term “comprising” as “comprising” is interpreted when employed as a transitional word in a claim. Furthermore, the term “or” as used in either the detailed description or the claims is meant to be a “non-exclusive or.”