Source: http://www.google.com/patents/US8094630?dq=6,826,762
Timestamp: 2016-07-02 06:20:06
Document Index: 335237271

Matched Legal Cases: ['Application No. 2005426813', 'application No. 200580024230', 'application No. 200580024230', 'application No. 200580024230', 'application No. 200580024230', 'application No. 200580024230', 'application No. 200580024230', 'Application No. 05750705', 'Application No. 06785637', 'application No. 06836082', 'Application No. 0811839', 'Application No. 0811839', 'application No. 2007', 'Application No. 06836082', 'application No. 200580024230', 'Application No. 0811839', 'Application No. 0811839', 'application No. 2007']

Patent US8094630 - Radio frequency dragging prevention - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA device receives information about signals detected by an access terminal, a first one of the signals corresponds to a radio node with which the access terminal is in communication, and if a second signal detected by the access terminal does not correspond to signals in use by the radio node and the...http://www.google.com/patents/US8094630?utm_source=gb-gplus-sharePatent US8094630 - Radio frequency dragging preventionAdvanced Patent SearchPublication numberUS8094630 B2Publication typeGrantApplication numberUS 11/303,773Publication dateJan 10, 2012Priority dateDec 16, 2005Fee statusPaidAlso published asUS20070140184Publication number11303773, 303773, US 8094630 B2, US 8094630B2, US-B2-8094630, US8094630 B2, US8094630B2InventorsDeepak Garg, Prasasth R. Palnati, Arthur J. BarabellOriginal AssigneeAirvana Network Solutions, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (276), Non-Patent Citations (158), Referenced by (10), Classifications (5), Legal Events (9) External Links: USPTO, USPTO Assignment, EspacenetRadio frequency dragging prevention
US 8094630 B2Abstract
A device receives information about signals detected by an access terminal, a first one of the signals corresponds to a radio node with which the access terminal is in communication, and if a second signal detected by the access terminal does not correspond to signals in use by the radio node and the access terminal, and if a condition is met, the devise causes the access terminal to alter communication with the radio node.
1. A method performed by at least one of a radio network controller or a radio node, comprising:
receiving information about signals detected by an access terminal, a first signal of the signals being generated by the radio node with which the access terminal is in communication, the radio node, the radio network controller, and the access terminal being in a radio access network, the radio access network comprising sectors, the radio network controller being in communication with the radio node, the radio network controller and the access terminal being different entities and the radio node and the access terminal being different entities;
if a second signal of the signals detected by the access terminal does not correspond to a signal between the radio node and the access terminal, and if a condition is met, instructing the radio node to instruct the access terminal to alter communication with the radio node;
evaluating the condition by comparing a quality of the second signal to a threshold;
transmitting second information for each of the sectors, wherein selection of the second information is based on criteria that are not same in each of the sectors; and
repeatedly transmitting a message to the access terminal,
wherein the message instructs the access terminal to send the information about signals,
wherein the condition comprises that the second signal detected by the access terminal has a quality greater than a threshold, and
wherein instructing the radio node to instruct the access terminal to alter communication comprises instructing the radio node to instruct the access terminal to transition between sectors.
receiving information about signals detected by an access terminal, a first signal of the signals being generated by a radio node with which the access terminal is in communication, the radio node and the access terminal being in a radio access network, the radio access network comprising sectors;
if a second signal of the signals detected by the access terminal does not correspond to a signal between the radio node and the access terminal, and if a condition is met, causing the access terminal to alter communication with the radio node;
transmitting second information for each sector, in which selection of the second information is based on criteria that are not same in each sector,
wherein the second information for each sector comprises an identification of a carrier used in that sector, and
wherein if two sectors are co-located in a first area, second information for one of the two sectors comprises an identification of a carrier used by another of the two sectors unless there is a neighboring second area in which no sector uses the carrier used by the other of the two sectors.
3. The method of claim 2, wherein if there is a first sector in the first area using a first carrier, and the access terminal is in the first sector using the first carrier, and there is the neighboring second area in which no sector uses the first carrier, then causing the access terminal to alter communication comprises:
instructing the access terminal to disconnect from the radio node and to connect to a second radio node using the second information transmitted for a second sector.
transmitting second information for each of the sectors, in which selection of the second information is based on criteria that are not the same in each of the sectors,
wherein the second information for each of the sectors comprises an identification of one or more sectors in a neighboring area that uses a same carrier as one or more of the sectors, and
wherein if a first sector in a first area uses a first carrier, and a second sector in a neighboring second area uses a second carrier, and there is no sector in the neighboring second area using the first carrier, then the second information for the first sector comprises an identification of the second sector.
5. The method of claim 4, wherein if there is the first sector in the first area using the first carrier, and the access terminal is in the first sector, and there is the neighboring second area in which no sector uses the first carrier, then causing the access terminal to alter communication comprises:
instructing the access terminal to disconnect from the radio node and to connect to a second radio node using the second information transmitted for the first sector.
6. The method of claim 1, wherein the quality of the second signal comprises a power of the second signal.
increasing a rate at which the message is repeatedly transmitted if the power of the second signal increases.
increasing a rate at which the message is repeatedly transmitted if the power of the second signal is above a threshold.
increasing a rate at which the message is repeatedly transmitted if the access terminal is in a sector that uses a carrier that is not used by a neighboring sector.
10. The method of claim 1, wherein the second information for each of the sectors comprises a first list and a second list, the first list for each of the sectors comprising an identification of a carrier used in at least one of the sectors, and the second list for each of the sectors comprising an identification of one or more sectors in a neighboring area that uses a same carrier as one or more of the sectors:
wherein if two sectors are co-located in a first area, a first list for one of the two sectors comprises an identification of a carrier used by another of the two sectors unless there is a neighboring second area in which no sector uses the carrier used by the other of the two sectors, and
wherein if a first sector in the first area uses a first carrier, and a second sector in the neighboring second area uses a second carrier, and there is no sector in the neighboring second area using the first carrier, then the second list for the first sector comprises an identification of the second sector.
11. A method performed by at least one of a radio network controller or a radio node, the method comprising:
evaluating the condition by comparing a power of the second signal to a threshold;
transmitting lists of second information for each of the sectors, wherein selection of the second information is based on criteria that are not same in each of the sectors; and
wherein at least some of the information about the signals detected by the access terminal are received in response to the message, and
wherein the condition comprises that the second signal has a power greater than a threshold.
12. The method of claim 1, wherein the second information for each of the sectors comprises a list, the list for each of the sectors comprising an identification of a carrier used in at least one of the sectors, and
wherein if two sectors are co-located in a first area, the list for each one of the two sectors comprises an identification of a carrier used by another of the two sectors unless there is a neighboring second area in which no sector uses the carrier used by the other of the two sectors.
13. The method of claim 1, wherein the second information for each of the sectors comprises a list, the list for each of the sectors comprising an identification of one or more sectors in a neighboring area that uses the same carrier as one or more of the sectors, and
wherein if a first sector in a first area uses a first carrier, and a second sector in a neighboring second area uses a second carrier, and there is no sector in the neighboring second area using the first carrier, then the list for the first sector comprises an identification of the second sector. Description
This application is related to U.S. application Ser. No. 11/037,896 filed on Jan. 18, 2005, Ser. No. 09/891,103, filed on Jun. 25, 2001, Ser. No. 10/848,597, filed on May 18, 2004, and Ser. No. 11/243,405, filed on Oct. 4, 2005, all of which are incorporated herein by reference.
This application is also related to U.S. application Ser. No. 11/305,286, filed on Dec. 16, 2005, and U.S. application Ser. No. 11/303,774, filed on Dec. 16, 2005, which are also incorporated herein by reference.
This invention relates to radio frequency dragging prevention.
High Data Rate (HDR) is an emerging mobile wireless access technology that enables personal broadband Internet services to be accessed anywhere, anytime (see P. Bender, et al., “CDMA/HDR: A Bandwidth-Efficient High-Speed Wireless Data Service for Nomadic Users”, IEEE Communications Magazine, July 2000, and 3GPP2, “Draft Baseline Text for 1xEV-DO,” Aug. 21, 2000). Developed by Qualcomm, HDR is an air interface optimized for Internet Protocol (IP) packet data services that can deliver a shared forward link transmission rate of up to 2.46 Mbit/s per sector using only (1�) 1.25 MHz of spectrum. Compatible with CDMA2000 radio access (TIA/EIA/IS-2001, “Interoperability Specification (IOS) for CDMA2000 Network Access Interfaces,” May 2000) and wireless IP network interfaces (TIA/EIA/TSB-115, “Wireless IP Architecture Based on IETF Protocols,” Jun. 6, 2000, and TIA/EIA/IS-835, “Wireless IP Network Standard,” 3rd Generation Partnership Project 2 (3GPP2), Version 1.0, Jul. 14, 2000), HDR networks can be built entirely on IP technologies, all the way from the mobile Access Terminal (AT) to the global Internet, thus taking full advantage of the scalability, redundancy and low-cost of IP networks.
An EVolution of the current 1xRTT standard for high-speed data-only (DO) services, also known as the 1xEV-DO protocol has been standardized by the Telecommunication Industry Association (TIA) as TLA/EIA/IS-856, “CDMA2000 High Rate Packet Data Air Interface Specification”, 3GPP2 C.S0024-0, Version 4.0, Oct. 25, 2002, which is incorporated herein by reference. Revision A to this specification has been standardized as TIA/EIA/IS-856, “CDMA2000 High Rate Packet Data Air Interface Specification”, 3GPP2 C.S0024-A, Version 2.0, June 2005. Revision A is also incorporated herein by reference.
FIG. 1A shows a 1xEV-DO radio access network 100 with radio network controllers 102 and 104 connected to radio nodes 108, 110, and 112 over a packet network 114. The packet network 114 can be implemented as an IP-based network that supports many-to-many connectivity between the radio nodes and the radio network controllers. The packet network is connected to the Internet 116 via a packet data serving node 106. Other radio nodes, radio network controllers, and packet networks (not shown in FIG. 1) can be included in the radio access network. The packet network 114 may be several distinct networks connecting individual radio network controllers to their associated radio nodes, or it may be a single network as shown in FIG. 1, or a combination.
Typically, each radio network controller controls 25-100 radio nodes and each radio node supports 1-4 carriers each of 1.25 MHz of bandwidth. A carrier is a band of radio frequencies used to establish airlinks with access terminals. The geographic area of the radio access network that is served by any given radio node is referred to as a cell. Each cell can be divided into multiple sectors (typically 3 or 6) by using multiple sectorized antennas (the term “sector” is used both conventionally and in this document, however, even when there is only one sector per cell).
Access terminals, e.g., devices 118, 120, and 122, communicate with the radio nodes of the network 100 over airlinks, e.g., links 124, 126, and 128. Each access terminal may be a laptop computer, a Personal Digital Assistant (PDA), a dual-mode voice/data handset, or another device, with built-in 1xEV-DO Rev-0 or Rev-A support. As 1xEvDO Rev-A is backwards compatible with 1xEvDO Rev-0, Rev-A capable access terminals can operate in either Rev-0 mode or Rev-A mode, depending on whether its serving radio node is Rev-0 or Rev-A capable. A Rev-0 device in communication with a Rev-A radio node will only be able to use Rev-0 services.
When an active access terminal moves from one sector to another, it asks for airlinks on new sectors via Route Update messages. In certain cases, the access terminal may not be able to obtain an airlink on a sector—as a result, the access terminal may remain in communication with the radio node of the sector it is leaving longer (instead of transitioning to the radio node of the sector it is entering). For example, in FIG. 1B, an access terminal 120 has moved from sector 1, where it was in communication with a radio node 110, into sector 2, served by radio node 112. The access terminal 120 is still in communication with the radio node 110 over an airlink 126, instead of establishing a new airlink 130 with the radio node 112. Each radio node transmits a pilot signal to identify itself and inform access terminals of the carriers the radio node uses and which revisions it supports. The access terminal 120 monitors pilot signals in its environment to determine which radio nodes it should establish communication with. An access terminal may be limited in its ability to receive or interpret pilot signals that are transmitted on different carriers or using different revisions than the access terminal is currently using. Likewise it may fail to recognize a pilot signal from a radio node on a different subnet than the radio node with which it is presently communicating. If the access terminal 100 does not recognize that it could use any of the signals it is detecting, or if it fails to detect signals it could use, it may remain in communication with the radio node 110 long after it could have established a better connection to the radio node 112. This condition is referred to as RF Dragging. RF Dragging can cause a degradation in the quality of service the user experiences, for example, a reduced rate of data transmission or an increased number of errors in transmission; in some cases, the connection may be dropped. In such a case, it may be desirable to disconnect the access terminal 120 from the radio node 110 serving the sector it is leaving to force it to transition to the radio node 112 serving the sector it is entering.
In general, in one aspect, a device receives information about signals detected by an access terminal, a first one of the signals corresponds to a radio node with which the access terminal is in communication, and if a second signal detected by the access terminal does not correspond to signals in use by the radio node and the access terminal, and if a condition is met, the devise causes the access terminal to alter communication with the radio node.
Implementations may include one or more of the following features. The altering includes closing communication with the radio node. The altering also includes opening communication with a radio node that is generating the second signal. The first and second signals originate from different radio access networks. The different radio access networks comprise radio access sub-networks. The different radio access networks are operated by different radio network operators. The first and second signals use different carriers. The first and second signals operate in different modes. The different modes comprise revision levels. Evaluating the condition comprises comparing a quality of the second signal to a threshold. The threshold is based on a quality of the first signal. The condition is met if the quality of the second signal is greater than the threshold. The information is received repeatedly, and the condition is met if the quality of the second signal is greater than the threshold during a number of sequential times that the information is received. The quality of the second signal is the power of the second signal. The quality of the first signal is the power of the first signal. The information is received from the access terminal. Sending a message instructing the access terminal to send the information. Sending the message repeatedly. A rate at which the message is repeated depends on a quality of the second signal. The quality is a power of the second signal. Increasing the rate if the power of the second signal is greater than a threshold. The threshold is based on a power of the first signal. A value to which the rate is increased is based on a number of times the condition must be met. The radio node and the access terminal are in a radio access network comprising sectors, and a rate at which the message is repeated depends on a location of the access terminal. A rate at which the message is repeated is increased if the access terminal is in a sector that uses a carrier that is not used by a neighboring sector. A value to which the rate is increased is based on a number of times the condition must be met.
Implementations may also include one or more of the following features. The radio node and the access terminal are in a radio access network comprising sectors. Transmitting information for each sector, in which selection of the information is based on criteria that are not the same in each sector. The criteria for the selection of information for a sector comprise resources available in the sector, in co-located sectors, and in neighboring sectors. The information for each sector includes an identification of a carrier used in that sector, and if two sectors are co-located in a first area, the information for each sector includes an identification of a carrier used by the other sector unless there is a neighboring second area in which no sector uses the carrier used by the other sector. If there is a first sector in a first area using a first carrier, and the access terminal is in the first sector using the first carrier, and there is a neighboring second area in which no sector uses the first carrier, then causing the access terminal to alter communication comprises instructing the access terminal to disconnect from the radio node and to connect to a second radio node using the information transmitted for a second sector. The information for each sector includes an identification of any sector in a neighboring area that uses the same carrier as that sector, and if a first sector in a first area uses a first carrier, and a second sector in a neighboring second area uses a second carrier, and there is no sector in the second area using the first carrier, then the information for the first sector includes an identification of the second sector. If there is a first sector in a first area using a first carrier, and the access terminal is in the first sector, and there is a neighboring second area in which no sector uses the first carrier, causing the access terminal to alter communication comprises instructing the access terminal to disconnect from the radio node and to connect to a second radio node using the information transmitted for the first sector. Causing the access terminal to alter communication comprises instructing the access terminal to transition between sectors. The information for each sector includes a first list and a second list. The first list for each sector includes an identification of a carrier used in that sector. The second list for each sector includes an identification of any sector in a neighboring area that uses the same carrier as that sector. If two sectors are co-located in a first area, then the first list for each sector includes an identification of a carrier used by the other sector unless there is a neighboring second area in which no sector uses the carrier used by the other sector. If a first sector in a first area uses a first carrier, and a second sector in a neighboring second area uses a second carrier, and there is no sector in the second area using the first carrier, then the second list for the first sector includes an identification of the second sector.
In general, in one aspect, a device receives information about at least two signals detected by an access terminal, places the signals into at least two groups, in which a first group comprises signals corresponding to a radio node with which the access terminal is in communication, and a second group comprises signals not corresponding to signals is use by the radio node and the access terminal, and if a signal in the second group meets a condition, causes the access terminal to alter communication with the radio node.
Among the advantages of the invention are one or more of the following. A radio network controller is able to determine that an access terminal is in a border area. The radio network controller can cause the access terminal to change its communications parameters so that it will minimize or prevent RF dragging. A user may experience a higher quality of service including fewer transmission errors, a higher data rate, and fewer lost connections.
FIGS. 1A, 1B, and 4 are diagrams of parts of radio access networks.
FIG. 2 is a diagram of several sectors in a radio access network.
FIG. 3 is a diagrams of several sectors and an access terminal in a radio access network.
In one example, the 1xEvDO radio access network 100 of FIG. 1A is implemented as a multi-revision, multi-carrier network having two subnets. Each subnet has a radio network controller and a number of radio nodes. The radio nodes of a subnet can be Rev-0-capable radio nodes, Rev-A-capable radio nodes, or a combination of both. Each radio node transmits signals to each sector of its cell using one or more carriers.
Suppose an access terminal 120 has a connection 126 with the radio network controller 102 through its serving radio node 110. As the access terminal 120 moves away from a coverage area of the serving radio node 110 and towards the coverage areas of other radio nodes 108 or 112, the access terminal detects the pilot signals transmitted by these radio nodes and reports its findings back to the radio network controller 102 in a Route Update message. The radio network controller 102 uses the information provided in the Route Update message to identify border situations in which it would be preferable to close the connection 126 to the access terminal 120 and trigger a connection re-establishment on a different carrier and/or mode of operation, such as revision level. In so doing, the radio network controller prevents or otherwise minimizes RF dragging.
The radio network controller can use a signal categorization approach, a route update approach, and/or a pilot beacon approach to identify border situations. Each approach is discussed below.
Signal Categorization Approach
In the signal categorization approach, the radio network controller 120 categorizes the pilot signals reported in the Route Update message according to several criteria, as illustrated in FIG. 4. The radio network controller attempts to identify each pilot signal reported in the Route Update message by looking at a list of neighboring sectors iteratively for each pilot signal. Pilot signals can be resolved into two categories, known or unknown. known signals can be further categorized as eligible or ineligible. Known signals (e.g., 418 and 420) are those that originate from a radio node (e.g., 410 and 412) in the same subnet as the radio node currently serving access terminal 120. The radio network controller can identify these signals based on their presence in a database of such signals. Unknown signals, those not in the database, (e.g., signal 416) may originate from a radio node on a different subnet or a radio access network operated by a different service provider, e.g., radio node 414. Eligible signals are known signals that are also on the same carrier and using the same revision as the existing communications link between access terminal 120 and radio node 110, e.g., signal 420 transmitted by radio node 412. Ineligible signals are those that are on a different carrier, revision, or both, e.g. signal 418 transmitted by radio node 410. Although an access terminal may communicate with a radio node using a different revision, some services may not be available, though a lowest common denominator of services can be supported. For this reason, a pilot signal using a different revision is treated similarly to one using a different carrier.
To avoid the degraded service that can result from RF dragging, the radio network controller 102 may command the access terminal 120 to disconnect from the radio node 110. This condition can be triggered when certain criteria are met. In one example, the signal strength of the pilot signals ranges between 0 and 63, in units of −0.5 dB, such that 0 is the strongest and 63 is the weakest possible signal strength. The connection is closed if the strength of the strongest unknown pilot signal exceeds the strength of the strongest known pilot signal by a value of 4 (2 dB) repeatedly over a configurable number of consecutive Route Update messages generated by the access terminal. The value set for the threshold could be higher or lower depending on the preferences of the network operator. The number of consecutive times that the condition must be met can also be configured according to the operator's preferences. When the conditions are met and the disconnect command is sent, the access terminal 120 will switch carriers, revisions, subnets, or service providers, as appropriate, so that it can establish a new link using the best available signal. Alternatively, it may be instructed in which parameter to change by the radio network controller 102 before it is disconnected. Not all access terminals can use all carriers or revisions, so the best available signal is not necessarily the strongest. Which signal is best may be influenced by such factors as services available with a particular revision, interference present on a particular carrier, load on each subnet, and the current service provider's relationship with the service provider of an unknown signal. Decisions about whether to disconnect and what services to use to reconnect may also be influenced by the geographical relationships between radio nodes, as explained below.
If an access terminal is moving towards another sector, but the unknown pilot signal from that sector was not yet sufficiently strong to trigger the conditions discussed above, the access terminal under normal conditions might not send another Route Update message until after entering the new sector. To prevent this, the radio network controller may request Route Update messages more frequently than the access terminal would normally send them. For example, if the strength of the unknown pilot signal is above 28, in the units of the previous example, but below or within 4 units above the strongest known pilot signal, the radio network controller may begin requesting Route Update messages every 60 ms. This will continue until either the strength of the unknown pilot signal exceeds that of the strongest known pilot signal by 4 units for the set number of times, or until it drops below 28 units. Other values could, of course, be used for the threshold strength values and the time between requests, based upon the preferences of the network operator.
Requests for Route Update messages may be paced by inserting quiet periods between two bursts (a burst consists of several requests), for example a burst of four requests separated by 20 ms repeated every 60 ms. By inserting quiet periods (of varying time periods), peculiar situations wherein the access terminal is stationary can be handled without excessive burden of generating Route Updates & processing Route Updates. In one example, the number of requests in a burst is greater than or equal to the number of sequential route update messages that would be required to report a sufficiently strong unknown pilot signal to trigger a disconnect. This will assure that the radio network controller is informed as soon as the access terminal moves sufficiently far into the range of the unknown pilot signal that it should be transitioned to that signal.
As illustrated in FIG. 2, the geographic regions serviced by radio nodes are referred to as cells, and the geographic relationship between cells may be considered in controlling a radio area network. Within a cell, there may be multiple sectors, based on the carriers used by the radio nodes, e.g. sectors 2A, 2B, and 2C in cell 2. Sectors may overlap, if two different carriers are used over the same area of a cell, for example, sectors 1A and 1B in cell 1. These are referred to as co-located sectors For the purposes of these examples, sectors in different cells using the same carrier will be labeled with the same letter in each cell. Carrier A is in use throughout cells 1 and 3 (sectors 1A and 3A), and in sector 2A of cell 2. Carrier B is in use throughout cells 1 and 4 (sectors 1B and 4B), and in sector 2B of cell 2. Border sectors are those that use a carrier that is not used in a neighboring sector. For example, sectors 1A and 3A are border sectors because carrier A is not used in an adjacent cell, cell 4. Likewise, sectors 1B and 4B are border sectors because carrier B is not used in cell 3 or in the area of cell 2 which is adjacent to sector 1B, i.e., the area covered by sector 2A. If an access terminal is in a border sector, e.g., sector 3A, communicating with the sector's radio node on its respective carrier, e.g., carrier A, and it moves into a neighboring sector that doesn't use that carrier, e.g., sector 4B, the access terminal may remain in communication with its old radio node rather than switching to the alternative radio node which is now closer. The identification of border cells can be useful in preventing this RF Dragging in several different ways.
Pilot Beacon Approach
One example, as illustrated in FIG. 3, is the pilot beacon approach to preventing RF Dragging. “Pilot beacon” is another term for the pilot signals discussed above. Under this approach, the pilot signal transmitted for each sector includes a channel list which lists the carriers available in that sector and in any co-located sectors. In FIG. 3, the channel list for each of sectors 1A, 1B, 2A, and 2B will ordinarily include carriers A and B, because both carriers are available in the area covered by each sector. Likewise, the channel list for sector 4 will only include carrier B because there is no co-located sector using carrier A. When an access terminal, e.g., access terminal 120, moves into a new sector, it consults the channel list for that sector to determine which carriers it can use to communicate with the radio node in that sector. This has advantages over relying upon the access terminal to detect the carriers in use, since if it is in active communication with the radio node from the sector it is leaving, it may only detect pilot signals on the carrier that it is currently using. Since the channel list is transmitted on each carrier, the active access terminal will still discover that it could be using a different carrier. The problem of RF Dragging is still present, however, when an active access terminal moves from a border sector to a sector that doesn't support the carrier the access terminal is presently using. For example, if the access terminal 120 is in sector 1A, and therefore using carrier A, and it moves to cell 4, where there is no sector using carrier A, it may remain connected to the radio node supporting sector 1A instead of switching to the radio node supporting sector 4B. The access terminal 120 will be expecting a channel list on its present carrier, A, but since sector 4B only uses carrier B, that is the only carrier on which it is transmitting any channel list. If the access terminal 120 had been in sector 1B, and therefore using carrier B, it would have made the transition to sector 4B without difficulty.
This problem is addressed in this example by modifying the channel list of the sector co-located with the border sector, that is, sector 1B. As shown in Table 302 of FIG. 3, sector 1B will only list carrier B in its channel list, even though carrier A is also available in that sector. As the access terminal 120 moves through cell 1 toward cell 4, using carrier A in sector 1A, the quality of signals from sector 4B will increase and the quality of signals from sectors 1A and 1B will decrease. When signals from sector 4B reach a certain threshold quality for a certain amount of time, indicating that the access terminal 120 might move to that sector, the radio network controller for these sectors (not shown) instructs the access terminal 120 to change carriers. The quality of the signal used to make this determination may be its power, data rate, or some other factor. Since the channel list from sector 1A told the access terminal 120 that carrier B was available, it will switch to that carrier and join sector 1B. Once in 1B, however, the channel list only lists carrier B, so the access terminal 120 will remain on carrier B rather than switching back to carrier A, which it might have otherwise done for a variety of reasons, such as to avoid interference with other devices using carrier B, or because sector 1A had fewer users than sector 1B. When it moves in to sector 4B, the access terminal 120 will be on the right carrier to get the channel list for the new sector and properly transition to the radio node for that sector. As in other examples, the momentary disruption from switching carriers may be less significant to a user of the access terminal 120 than the degradation of service that the user would experience if the access terminal experienced RF dragging as it moved into sector 4B. If the conditions triggering the switch require that the new sector's signal must reach the threshold quality for a certain amount of time, or for a certain number of periodic samples, a hysteresis will occur, such that once switched, the access terminal 120 will remain on its new carrier for at least that same amount of time, rather than continually switching back and forth while it is in an area where switch-over criteria are met.
Route Update Approach
A second example, also illustrated in FIG. 3, is the route update approach to preventing RF Dragging. Under this approach, the channel list is not modified as in the pilot beacon approach, but a second list, a neighbor list, transmitted separately from the pilot beacon, is modified to allow the access terminal to report appropriate pilot signals. Normally, the neighbor list for a given sector lists the neighboring sectors that use the same carrier. For example as shown in Table 304, the neighbor list for sector 1B includes 2B and 4B, since both of those sectors neighbor sector 1B and use the same carrier. Using the neighbor list, an active access terminal moving through a sector looks for new sectors only on the carrier it is already using. In the example of FIG. 3, if an access terminal 120 is using carrier B, as it moves through sector 1B, it references sector 1B's neighbor list and therefore monitors pilot signals from sectors 2B and 4B so that it can switch to them when it moves into the corresponding sectors.
In a border sector, e.g., sector 1A, the neighbor list is modified to include neighboring sectors that use different carriers. Since carrier A is not used in the area of sector 4B, sector 1A is a border sector, and its neighbor list will include 2A and 4B. This way, if an access terminal 120 is active on carrier A as it moves through sector 1A, it will monitor pilot signals on both carriers A and B, looking for sectors 2A or 4B. As it draws near to sector 4B, the pilot signal on carrier B will be better than either the current signal or the pilot signal from sector 2A. Observing this, the radio network controller (not shown) for these sectors will instruct the access terminal 120 to close its connection. When the access terminal re-opens its connection, it will do so on channel B since that is the better signal, and it will be able to move smoothly between sectors 1B (if its still in cell 1) and 4B. If the neighbor list for sector 1A had not included 4B, the access terminal would only have been monitoring pilot signals on carrier A and would not have found sector 4B. As in other examples, the momentary disconnection required to switch carriers is less disruptive than remaining on carrier A as its signal faded. The radio network controller will require that the criteria for switching are met for a minimum amount of time or number of cycles, so that an access terminal remaining in a transition area will not continually switch back and forth between carriers.
The same approaches can be used with parameters other than carriers, for example channel lists or neighbor lists could list which revisions or subnets are available, so that that information can be used in determining when to disconnect & reestablish a connection and what parameters to change when doing so.
In the examples of FIGS. 3 and 4, the radio network controller 102 (FIG. 4) may poll the access terminal 120 periodically to determine which pilot signals it is receiving. To improve the decision-making process, the radio network controller may poll the access terminal more often when it is in a border cell or is detecting unknown or ineligible signals, so that the decision to switch carriers or other parameters may be made at the optimum time. This increase in polling frequency also helps the radio network controller to maintain a hysteresis, that is, making sure that an access terminal doesn't continually switch back and forth while it is in an area where criteria might otherwise be met to switch back to its previous settings as soon as it switched as instructed.
Any of the examples above may be combined to provide even more robust prevention of RF Dragging. For example, categorization of signals into known or unknown and eligible or ineligible may be combined with channel lists as in the pilot beacon approach so that both the fact that an access terminal is in a border sector and the usefulness of the various signals from the neighboring cells can be used to determine when to switch carriers, revisions, or other parameters. Similarly, both channel lists and neighbor lists in border sectors may be modified so that access terminals in border sectors are informed as to both what channels are available and which neighboring sectors use those channels.
Although the techniques described above employ the 1xEV-DO air interface standard, the techniques are also applicable to other CDMA and non-CDMA air interface technologies.
A number of embodiments of the invention have been described. Nevertheless, it will be understood that various modifications may be made without departing from the spirit and scope of the invention. For example, pilot signals from different subnets might be categorized as known, rather than unknown, if those subnets have a particular relationship. Accordingly, other embodiments are within the scope of the following claims.
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