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Patent US7773566 - System and method for maintaining timing of synchronization messages over a ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA method for operating a subscriber unit that communicates with a code division multiple access (CDMA) wireless network is provided. At the subscriber unit, synchronization information is encoded with a CDMA code. The CDMA encoded synchronization information is transmitted from the subscriber unit in...http://www.google.com/patents/US7773566?utm_source=gb-gplus-sharePatent US7773566 - System and method for maintaining timing of synchronization messages over a reverse link of a CDMA wireless communication systemAdvanced Patent SearchPublication numberUS7773566 B2Publication typeGrantApplication numberUS 10/895,591Publication dateAug 10, 2010Filing dateJul 21, 2004Priority dateJun 1, 1998Fee statusPaidAlso published asUS20050013284Publication number10895591, 895591, US 7773566 B2, US 7773566B2, US-B2-7773566, US7773566 B2, US7773566B2InventorsJames A. Proctor, Jr.Original AssigneeTantivy Communications, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (104), Non-Patent Citations (118), Classifications (17), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetSystem and method for maintaining timing of synchronization messages over a reverse link of a CDMA wireless communication system
US 7773566 B2Abstract
A method for operating a subscriber unit that communicates with a code division multiple access (CDMA) wireless network is provided. At the subscriber unit, synchronization information is encoded with a CDMA code. The CDMA encoded synchronization information is transmitted from the subscriber unit in discrete repeating intervals. The discrete repeating intervals are separated by other discrete repeating intervals during which the subscriber unit does not transmit synchronization information.
1. A method for use in a subscriber unit in a code division multiple access (CDMA) wireless network, the method comprising:
receiving a message defining a timeslot assignment for a code phase reverse channel of the subscriber unit, wherein the timeslot assignment defines timeslots to be used only during an idle mode;
encoding synchronization information with a CDMA code;
monitoring a buffer to determine whether additional code phase channels are required to support the reverse channel;
on a condition that the additional code phase channels are not required, the subscriber unit remains in the idle mode; and
transmitting, during the idle mode, the CDMA encoded synchronization information on an assigned code phase channel, wherein the transmission of the CDMA encoded synchronization information is based on the received timeslot assignment.
monitoring the buffer;
supplying user information to the buffer;
requesting permission to use a first CDMA code for supporting transmission of a portion of the user information;
requesting permission to use a second CDMA code for supporting transmission of the user information not in the portion; and
transmitting the user information using the first CDMA code and the second CDMA code.
3. The method of claim 1 wherein the message defining the timeslot assignment defines a repeating timeslot interval.
4. The method of claim 1 wherein the CDMA encoded synchronization information comprises a heartbeat message.
5. The method of claim 1 wherein the transmitting of the CDMA encoded synchronization information occurs when the subscriber unit is in an idle mode and does not occur when the subscriber unit is transmitting user information.
This application is a continuation of application Ser. No. 09/997,732, filed Nov. 29, 2001 which is a continuation-in-part of application Ser. No. 09/778,474, filed Feb. 7, 2001, and a continuation of application Ser. No. 09/730,376, filed Dec. 5, 2000, now U.S. Pat. No. 6,707,804, which is a continuation of application Ser. No. 09/088,413, filed Jun. 1, 1998, now U.S. Pat. No. 6,222,832. The entire teachings of the above applications are incorporated herein by reference.
There still is no widely available satisfactory solution for providing low cost, broad geographical coverage, high speed access to the Internet, private intranets, and other networks using the existing wireless infrastructure. This situation is most likely an artifact of several unfortunate circumstances. For one, the typical manner of providing high speed data service in the business environment over the wireline network is not readily adaptable to the voice grade service available in most homes or offices. Such standard high speed data services also do not lend themselves well to efficient transmission over standard cellular wireless handsets. Furthermore, the existing cellular network was originally designed only to deliver voice services. As a result, the emphasis in present day digital wireless communication schemes lies with voice, although certain schemes such as CDMA do provide some measure of asymmetrical behavior for the accommodation of data transmission. For example, the data rate on an IS-95 forward traffic channel can be adjusted in increments from 1.2 kbps up to 9.6 kbps for so-called Rate Set 1 and in for increments from 1.8 kbps up to 14.4 kbps for Rate Set 2.
What is needed is an efficient scheme for supporting wireless data communication such as from portable computers to computer networks such as the Internet and private intranets using widely available infrastructure. Unfortunately, even the most modern wireless standards in widespread use such as CDMA do not provide adequate structure for supporting the most common activities, such as web page browsing. Due to IS-95 being circuit-switched, there are only a maximum of 64 circuit-switched users that can be active at one time. In practicality, this limit is difficult to attain, and 20 or 30 simultaneous users are typically used, however certain implementations allow aggregation of up to 8 codes on a channel.
One aspect of the present invention is directed to a method for operating a subscriber unit that communicates with a code division multiple access (CDMA) wireless network. The method comprises encoding at the subscriber unit synchronization information with a CDMA code, and transmitting from the subscriber unit the CDMA encoded synchronization information in discrete repeating intervals. The discrete repeating intervals may be separated by other discrete repeating intervals during which the subscriber unit does not transmit synchronization information.
The method may further comprise monitoring a buffer at the subscriber unit, supplying user information to the buffer, and requesting permission to use a first CDMA code for supporting the transmission of a portion of the user information. Permission is also requested to use a second CDMA code for supporting the transmission of the user information not in the portion. The user information is transmitted from the subscriber unit using the first and second CDMA codes.
Each discrete repeating interval may comprise a time slot of a recurring frame. The discrete repeating intervals may be of equal duration. The method may further comprise the step of receiving a message defining a size of the discrete repeating intervals. The synchronization information may comprise a heartbeat message. The step of transmitting synchronization information in discrete repeating intervals may not occur during the step of transmitting user information.
Another aspect of the present invention is to provide a method for operating a subscriber unit to maintain synchronization when not actively transmitting data. The method comprises receiving from a base station a message defining discrete repeating intervals during which the subscriber unit transmits synchronization information encoded with a CDMA code at the subscriber unit. The encoded synchronization information is transmitted from the subscriber unit to the base station in the discrete repeating intervals.
Yet another aspect of the present invention is to provide a method for supporting variable rate data transfers on a communication link between a base station and a field unit in a wireless CDMA communication system. The method comprises transmitting user information from the field unit to the base station using a first allocation of bandwidth. Synchronization information is transmitted from the field unit to the base station using a second allocation of bandwidth during discrete repeating intervals of time when the field unit is not actively transmitting user information using the first allocation of bandwidth.
More recently, the cdma-2000 system provides a variable spreading factor to increase data rate rather than using additional long codes. Only a single long code is used, and different data rate are obtained by changing the chips per data bit or the length of the orthogonal code. Further, additional orthogonal codes within the code phases are employed.
The ISDN modem 120 converts data and voice signals between the terminal equipment 110 and 112 to format required by the standard ISDN �U� interface. The U interface is a reference point in ISDN systems that designates a point of the connection between the network termination (NT) and the telephone company.
It should also be understood that data signals travel bidirectionally across the CDMA radio channels 160. In other words, data signals received from the PSTN-180 are coupled to the portable computer 110 in a forward link direction, and data signals originating at the portable computer 110 are coupled to the PSTN 180 in a so-called reverse link direction. The present invention involves in particular the manner of implementing the reverse link channels.
In order to better understand how bandwidth management 134 and 174 accomplish the dynamic allocation of radio channels, turn attention now to FIG. 2. This figure illustrates one possible frequency plan for the wireless links 160 according to the invention. In particular, a typical transceiver 170 can be tuned on command to any 1.25 MHz channel within a much larger bandwidth, such as up to 30 MHz. In the case of location in an existing cellular radio frequency band, these bandwidths are typically made available in the range of from 800 to 900 MHz. For personal communication systems (PCS) type wireless systems, the bandwidth is typically allocated in the range from about 1.8 to 2.0 GigaHertz (GHz). In addition, there are typically two matching bands active simultaneously, separated by a guard band, such as 80 MHz; the two matching bands form forward and reverse full duplex link.
A relatively large number, N, such as 1000 individual subscriber units are then supported by using a single long pseudonoise (PN) code in a particular way. First, a number, p, of code phases are selected from the available 242-1 different long code phases. A given long code phase is unique to a particular subscriber unit and never changes. As will be explained, this is also true for supplemental code phases as well. The code p phases shifts are then used to provide p subchannels. Next, each of the p subchannels are further divided into s time slots. The time slotting is used only during the idle mode, and provides two advantages; it reduces the numbers of �maintenance� receivers in the base station, and it reduces the impact to reverse channel capacity by reducing transmit power and thus interference. Therefore, the maximum supportable number of supportable subscriber units, N, is p times s. During Idle mode, use of the same PN code with different phases and time slots provides many different subchannels with permits using a single rake receiver in the base station 104.
where Eb is the energy per bit, No is the ambient noise floor, and lo is the mutual interference from other coded transmissions of the other sub-channels on the reverse link sharing the same spectrum. Typically, to close the link requires integration over 8 chip times at the receiver, and a multiple of 20 times that is typically needed to guarantee detection. Therefore, about 160 chip times are typically required to correctly receive the coded signal on the reverse link. For a 1.2288 MHz code, Tc, the chip time, is 813.33 ns, so that this minimum integration time is about 130 μs. This in turn sets the absolute minimum duration of a data bit, and therefore, the minimum duration of a slot time, t. The minimum slot time of 130 μs is means that at a maximum, 7692 time slots can be made available per second for each phase coded signal.
P n+1= {Po}
After step 452 is processed, a request is made for code phase channels. If granted (step 452-b), processing proceeds to step 453, and if not granted, processing proceeds to step 451 in order to process the additional channel requests. In a next state 453, the subscriber unit begins transmitting its data on its assigned code phase channels. In state 454, it continues to monitor its internal data buffers and its associated forward access channel to determine when to return to the idle mode 400, or state 451, to determine if new code phase channels must be assigned, or to state 455, where they are deallocated.
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