US20110128851A1 - Reverse Link Power Control - Google Patents

Reverse Link Power Control Download PDF

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US20110128851A1
US20110128851A1 US12955610 US95561010A US2011128851A1 US 20110128851 A1 US20110128851 A1 US 20110128851A1 US 12955610 US12955610 US 12955610 US 95561010 A US95561010 A US 95561010A US 2011128851 A1 US2011128851 A1 US 2011128851A1
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pct
value
power control
device
connection
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Sepehr Mehrabanzad
Satish Ananthaiyer
Gopal Harikumar
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Sepehr Mehrabanzad
Satish Ananthaiyer
Gopal Harikumar
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC [Transmission power control]
    • H04W52/06TPC algorithms
    • H04W52/14Separate analysis of uplink or downlink
    • H04W52/146Uplink power control

Abstract

This description describes examples of performing reverse link power control in a mobile network having a plurality of first modem devices that receive and transmit signals to wireless access terminals (ATs) and a second device in communication with the plurality of first devices. One of the first devices derives a first power control threshold (PCT) value for reverse link power of one of the access terminals (ATs) and the second device derives a second power control threshold (PCT) value for reverse link power of the one of the ATs. The second power control threshold (PCT) value is transmitted using a data traffic path and either the first PCT value or the second PCT value is selected.

Description

    BACKGROUND
  • This description relates to reverse link power control.
  • ACRONYMS AND ABBREVIATIONS
    • 1x-EVDO: Evolution Data only, CDMA2000 family standard for high speed data only wireless internet access
    • AN: Access Network
    • API: Application Programmable Interface
    • ASIC: Application Specific Integrated Circuit
    • AT: Access Terminal
    • BIO-SC: Basic Input/Output—System Controller
    • CDMA: Code-Division Multiple Access
    • CPU: Central Processing Unit
    • CSM5500 ASIC: Qualcomm Inc. modem ASIC
    • CSM5500 Drivers: Qualcomm Inc. modem ASIC Driver and API
    • FCS: Frame Check Sequence
    • FER: Frame Error Rate
    • FLM: Forward Link Modem
    • IP: Internet Protocol
    • PCT: Power Control Threshold
    • PCTRNi: Power Control Threshold computed at ith RN
    • PCTRNC: Power Control Threshold computed at RNC
    • RAN: Radio Access Network
    • RL: Reverse Link or uplink—from mobile to base station.
    • RLILPC: Reverse Link Inner-Loop Power Control
    • RLM: Reverse Link Modem
    • RLOLPC: Reverse Link Outer-Loop Power Control
    • RLOLPC-RN: Power Control Algorithm running on RN
    • RLOLPC-RNC: Power Control Algorithm running on RNC
    • RN: Radio Node or Base Station
    • RN-BIO-SC: Radio Node BIO-SC Card or module
    • RNC: Radio Network Controller
    • RNSM: Radio Network Serving Module
    • RPC: Reverse Power Control
    • RTCHMO: Reverse Traffic Channel MAC Object
    • SDU: Selection and Distribution Unit
    • SINR: Signal-to-Interference Ratio (Eb/It)
  • Capacity of a cellular system represents the total number of mobile users (access terminals or ATs) that can be supported by the system. Capacity can be an important factor for cellular service providers, since it directly impacts revenue. CDMA wireless communications systems offer improved capacity and reliable communications for cellular and PCS systems.
  • In a CDMA system, each AT transmit signal utilizes a different pseudo random sequence signal that appears as noise to other ATs. This enables many ATs to transmit on the same frequency. However, each AT's transmitted signal contributes to interference to the transmitted signal of all other users. Thus, the total number of users supported by the system is limited by interference. Therefore, reducing the amount of interference in a CDMA wireless communications system increases capacity.
  • A typical problem in a CDMA cellular environment is the near/far problem. This entails the scenario where the transmit power of an AT near the RN may drown out an AT which is far from the RN. This is effectively mitigated by controlling the transmit power of each AT via power control scheme implemented by the access network (AN). AN continuously commands each AT to increase or decrease its transmit power to keep them all transmitting at the minimal power required to achieved the configured error rate for the operating data rate and maintain the overall balance of the power while reducing the interference in the area of coverage.
  • In a CDMA 1x-EVDO system (see e.g., CDMA2000 High Data Rate Packet Data Air Interface Specification, 3GPP2 C.S0024, Version 4.0, Oct. 25, 2002), the reverse link operates in CDMA and hence reverse link power control is needed. The reverse link power control comprises of an open-loop power control (also called autonomous power control) and closed-loop power control. Open-loop power control is implemented in an AT, based on the received pilot-power of an RN. Closed-loop power control includes inner loop power control and outer loop power control, both of which are performed by the access network. Typical operation of a closed loop power control can be found in textbooks (see e.g., Vijay K. Garg, IS-95 CDMA and CDMA2000 Cellular/PCS Systems Implementation, Chapter 10, Prentice Hall, 1999, R. Steele. Mobile Radio Communications. Pentech Press, London, England, 1992, and Rashid A. Attar and Eduardo Esteves, A Reverse Link Outer-Loop Power Control Algorithm for CDMA2000 1xEV Systems, Proceedings of ICC, Apr. 2002). Also, additional details can be found in e.g., U.S. Pat. No. 6,633,552, titled Method And Apparatus For Determining The Closed Loop Power Control Set Point In A Wireless Packet Data Communication System, and issued on Oct. 14, 2003, U.S. Pat. No. 6,507,744, titled Outer Loop Power Control Method During A Soft Handoff Operation, and issued on Jan. 14, 2003, and U.S. Pat. No. 5,884,187, titled Outer Loop Power Control Method During A Soft Handoff Operation, and issued on Mar. 16, 1999. A typical implementation is now described.
  • FIG. 1 illustrates a system 100 implementing the basic closed loop power control operation. In closed loop power control, power adjustment is done at an AT 105 in accordance with the power control commands received from an RN 110 (also referred to as a base station 110). RN 110 sends up/down commands to each active AT (e.g., 105) to ensure that the AT transmit signal is received at the RN 110 at the lowest possible power required for the RN 110 to receive the data correctly at the operating rate.
  • In a reverse link inner-loop power control (RLILPC) mechanism 115, the reverse link signal to the interference-noise ratio (SINR) is continuously and frequently measured at a modem receiver of RN110. These frequent measurements track rapid channel variations of the link between the AT 105 and the RN 110 and facilitate accurate power control even when the AT 105 is in a deep fade. This measured of SINR is compared to a threshold value called ‘power control threshold’ (PCT). If the measured value is greater than PCTmax (=PCT+PCTDelta), the RPC bit is cleared. If the measured value is less than PCTmin (=PCT-PCTDelta), RPC bit is set. PCTDelta is a small value that provides an interval around the PCT. If the PCT is within this interval, the RPC bit status is unchanged from the previous value. Setting the RPC bits (‘up decisions’) commands AT 105 to increase its transmit power by a pre-determined step size, say ‘x’ dB. Clearing RPC bits (‘down decisions’) commands the AT 105 to decrease its transmit power by ‘x’ dB. The step size is negotiated a priori between RN 110 and AT 105.
  • Frame Error Rate (FER) is defined as a ratio of the bad frames to the total number of frames received by the RN 110. A frame with correct physical layer frame check sequence (FCS) is defined to be a good frame. In 1x-EVDO, the physical layer cyclic redundancy code (CRC) can be used to determine good or bad frames. In a reverse link closed outer-loop power control (RLOLPC) algorithm 120, the PCT is adaptively adjusted such that the configured target FER is achieved and maintained for the duration of the connection. (A target reverse link FER of 1% is considered typical for wireless networks). The RLOLPC algorithm 120 is implemented in a RNC 125.
  • It should be noted that there is another parameter beside FCS that is used in the voice application in CDMA system. This parameter is called the quality metric, which is an indication of how “bad” the bad frame is. For voice, it may be beneficial to play out a bad packet in order to maintain the perception of a good voice quality. Therefore, even the bad packets are still sent to the RNC 125 from the RN 110 with the marking for a correct FCS and a quality metric. It's up to the RNC 125 to determine if the quality metric meets the criteria for the packet to be used even when the FCS is incorrect.
  • Typical operation of the RLOLPC algorithm 120 is described now. Upon reception of a RL frame with bad FCS, PCT is increased by a pre-set large value (e.g., 0.5 dB), which is termed a good frame PCT Delta. Upon reception of a RL frame with good FCS, PCT is decreased by a pre-set small value (e.g., 0.5 dB), which is termed a bad frame PCT Delta. Given the values of RL FER and the good frame PCT Delta, the bad frame PCT Delta value is computed as follows :
  • Bad Frame PCT Delta=Good Frame PCT Delta (1−RL FER)/RL FER (Note that this same equation can be used to compute the good frame PCT Delta given the values of RL FER and the bad frame PCT Delta.) Before a connection establishment, or if there is no data on a RL, the PCT is set to a pre-set high value to facilitate rapid reverse link acquisition. A new value of the PCT is computed upon reception of each good/bad RL frame and an updated PCT is input into the RN modem receiver and to the RLILPC algorithm 115.
  • FIG. 2 illustrates an example system 200, in which AT 105 is in a L-way soft hand-off (i.e., AT 105 is communicating with L RNs, e.g., RN1 110, RN2 205, and RNL 210, at the same time). The selection and distribution unit (SDU) (not shown) at the RNC 125 determines which received frame from all the different ‘legs’ should be used. In addition it determines if correct or incorrect received frame indication needs to be send to the RLOLPC algorithm 120 on each frame boundary. The RLOLPC algorithm 120 uses this information to compute the overall PCT for the AT 105. This PCT value is sent to all L RNs involved in the soft hand-off.
  • SUMMARY OF INVENTION
  • In one aspect, there is a method of performing reverse link power control in a mobile network having a plurality of first modem devices that receive and transmit signals to wireless access terminals (ATs) and a second device in communication with the plurality of first devices. The method includes transitioning execution between a first and a second loop to control reverse link power of one of the ATs, the transition being based on a state of a connection. The first control loop executes at one of the first devices and the second loop executes at the second device.
  • Other examples can include one or more of the following features. The transitioning can include synchronizing between the first control loop and the control loop based on a change of the state. The change of the state of the connection can include transitioning from the connection not in handoff to the connection in soft handoff. The method can include transmitting to the second control loop a value for a power control threshold calculated by the first control loop. The transmitting can include transmitting the value for the power control threshold during transmission of handoff-related data. The method can include deriving a power control threshold using the first or second control loop.
  • The method can include generating, by the one of the first devices, an indicator representing quality of a signal received from the one of the ATs, and calculating a power control threshold using the indicator. The method can include preventing transmission of a packet from the one of the first devices to the second device if the packet is associated with a bad indication. The method can include transmitting the bad indication to the second device. The method can include determining good or bad indication of a packet using a cyclic redundancy code (CRC) associated with the packet. The state of the connection can include the connection not in handoff, the connection in softer handoff, or the connection in soft handoff. The method can include communicating between the first devices and the second device using Internet Protocol (IP) or asynchronous transfer mode (ATM).
  • In another aspect, there is a method of performing reverse link power control in a mobile network having a plurality of first modem devices that receive and transmit signals to wireless access terminals (ATs) and a second device in communication with the plurality of first devices. The method includes deriving, by one of the first devices, a first power control threshold (PCT) value for reverse link power of one of the access terminals (ATs) and deriving, by the second device, a second power control threshold (PCT) value for reverse link power of the one of the ATs. The method also includes transmitting the second power control threshold (PCT) value using a data traffic path and selecting the first PCT value or the second PCT value.
  • Other examples can include one or more of the following features. The transmitting can include transmitting using User Datagram Protocol or Generic Route Encapsulation protocol. The transmitting can include transmitting the second power control threshold (PCT) value based on a state of a connection. The state of the connection can include the connection in soft handoff. The second PCT value can be selected when the second PCT value is received at the one of the first devices. The first PCT value can be selected when a connection is not in handoff or a connection is in softer handoff. The second PCT value can be selected when a connection is in soft handoff.
  • The method can include generating, by the one of the first devices, an indicator representing quality of a signal received from the one of the ATs, and calculating the first PCT and the second PCT using the indicator. The method can include preventing transmission of a packet from the one of the first devices to the second device if the packet is associated with a bad indication; and transmitting the bad indication to the second device. The method can include determining good or bad indication of a packet using a cyclic redundancy code (CRC) associated with the packet. The method can include communicating between the first devices and the second device using Internet Protocol (IP) or asynchronous transfer mode (ATM).
  • In another aspect, there is a system for performing reverse link power control in a radio access network (RAN). The system includes a first modem device and a second device in communication with the first device over a network. The first modem device receives and transmits signals to a wireless access terminal (AT). The first device is configured to execute a first loop to control reverse link power of the AT based on a first state of a connection. The second device is configured to execute a second loop to control reverse link power of the AT based on a second state of the connection and to synchronize the second loop with the first loop during a transition from the first state to the second state.
  • Other examples can include one or more of the following features. The first state of the connection can include the connection not in handoff or the connection in softer handoff. The second state of the connection can include the connection in soft handoff. The second device can be configured to obtain a power control threshold calculated by the first control loop. The second device can be configured to obtain a power control threshold calculated by the first control loop during transmission of handoff-related data. The first device can be configured to derive a power control threshold using the first control loop.
  • The first device can be configured to generate an indicator representing quality of a signal received from the AT and to calculate a power control threshold using the indicator. The first device can be configured to prevent transmission of a packet from the first device to the second device if the packet is associated with a bad indication and to transmit the bad indication to the second device in place of the packet. The first device can be configured to determine good or bad indication of a packet using a cyclic redundancy code (CRC) associated with the packet. The first device and the second device can communicate using Internet Protocol (IP) or asynchronous transfer mode (ATM).
  • In another aspect, there is a system for performing reverse link power control. The system includes a first modem device and a second device in communication with the first device over a network. The first modem device receives and transmits signals to a wireless access terminal (AT). The first device is configured to derive a first power control threshold (PCT) value for reverse link power of an AT. The second device is configured to derive a second power control threshold (PCT) value for reverse link power of the AT and to transmit the second power control threshold (PCT) value to the first device using a data traffic path.
  • Other examples can include one or more of the following features. The first device can be configured to transmit the second power control threshold (PCT) value to the first device over the data traffic path using User Datagram Protocol or Generic Route Encapsulation protocol. The first device can be configured to select the first PCT value or the second PCT value. The first device can be configured to select the second PCT value when the second PCT value is received at the first device. The first device can be configured to select the first PCT when the connection is not in handoff or the connection is in softer handoff. The first device can be configured to select the second PCT value when the connection is in soft handoff.
  • The first device can be configured to generate an indicator representing quality of a signal received from the AT and to calculate the first PCT using the indicator. The first device can be configured to prevent transmission of a packet from the one of the first devices to the second device if the packet is associated with a bad indication and to transmit the bad indication to the second device. The first device can be configured to determine good or bad indication of a packet using a cyclic redundancy code (CRC) associated with the packet. The first device and the second device can communicate using Internet Protocol (IP) or asynchronous transfer mode (ATM).
  • In another aspect, there is a computer program product, tangibly embodied in an information carrier, for performing reverse link power control in a mobile network having a plurality of first modem devices that receive and transmit signals to wireless access terminals (ATs) and a second device in communication with the plurality of first devices. The computer program product includes instructions being operable to cause data processing apparatus to transition execution between a first and a second loop to control reverse link power of one of the ATs, where the transition is based on a state of a connection, and the first control loop executes at one of the first devices and the second loop executes at the second device.
  • Other examples can include one or more of the following features. The computer program product of can include instructions operable to cause the data processing apparatus to synchronize between the first control loop and the control loop based on a change of the state. The change of state of the connection can include transitioning from the connection not in handoff to the connection in soft handoff.
  • The computer program product can include instructions operable to cause the data processing apparatus to transmit to the second control loop a value for a power control threshold calculated by the first control loop. The computer program product can include instructions operable to cause the data processing apparatus to transmit the value for the power control threshold during transmission of handoff-related data.
  • The computer program product can include instructions operable to cause the data processing apparatus to derive a power control threshold using the first or second control loop. The computer program product can include instructions operable to cause the data processing apparatus to generate, by the one of the first devices, an indicator representing quality of a signal received from the one of the ATs, and calculate a power control threshold using the indicator. The computer program product can include instructions operable to cause the data processing apparatus to prevent transmission of a packet from the one of the first devices to the second device if the packet is associated with a bad indication, and transmit the bad indication to the second device. The computer program product can include instructions operable to cause the data processing apparatus to determine good or bad indication of a packet using a cyclic redundancy code (CRC) associated with the packet. The state of the connection can include the connection not in handoff, the connection in softer handoff, or the connection in soft handoff. The computer program product can include instructions operable to cause the data processing apparatus to communicate between the first devices and the second device using Internet Protocol (IP) or asynchronous transfer mode (ATM).
  • In another aspect, there is a computer program product, tangibly embodied in an information carrier, for performing reverse link power control in a mobile network having a plurality of first modem devices that receive and transmit signals to wireless access terminals (ATs) and a second device in communication with the plurality of first devices. The computer program product includes instructions being operable to cause data processing apparatus to derive, by one of the first devices, a first power control threshold (PCT) value for reverse link power of one of the access terminals (ATs), derive, by the second device, a second power control threshold (PCT) value for reverse link power of the one of the ATs, transmit the second power control threshold (PCT) value using a data traffic path, and select the first PCT value or the second PCT value.
  • Other examples can include one or more of the following features. The computer program product can include instructions operable to cause the data processing apparatus to transmit using User Datagram Protocol or Generic Route Encapsulation protocol. The computer program product can include instructions operable to cause the data processing apparatus to select the second PCT value when the second PCT value is received at the one of the first devices. The computer program product can include instructions operable to cause the data processing apparatus to select the first PCT value when a connection is not in handoff or a connection is in softer handoff. The computer program product can include instructions operable to cause the data processing apparatus to select the second PCT value when a connection is in soft handoff. The computer program product can include instructions operable to cause the data processing apparatus to generate, by the one of the first devices, an indicator representing quality of a signal received from the one of the ATs, and calculate the first PCT and the second PCT using the indicator.
  • The computer program product can include instructions operable to cause the data processing apparatus to prevent transmission of a packet from the one of the first devices to the second device if the packet is associated with a bad indication and transmit the bad indication to the second device. The computer program product can include instructions operable to cause the data processing apparatus to determine good or bad indication of a packet using a cyclic redundancy code (CRC) associated with the packet. The computer program product can include instructions operable to cause the data processing apparatus to communicate between the first devices and the second device using Internet Protocol (IP) or asynchronous transfer mode (ATM).
  • Among the advantages of the system are one or more of the following. By reducing RNC-RN signaling (e.g., sending PCT only for connections in handoff), there is a reduced backhaul bandwidth consumption. Similarly, by reducing RN-RNC data traffic (e.g., sending only an indication of bad frames to a RNC, excluding the payload), there is a reduced backhaul bandwidth consumption. Other features and advantages will become apparent from the following description and from the claims.
  • DESCRIPTION
  • FIG. 1 is a block diagram illustrating reverse link power control in an example CDMA System.
  • FIG. 2 is a block diagram illustrating reverse link power control in another example CDMA System.
  • FIG. 3 is a block diagram illustrating a system for distributed reverse link power control.
  • FIG. 4 is a block diagram depicting an example system for reverse link power control on the RN.
  • FIG. 5 is a block diagram depicting an example system for reverse link power control on the RNC.
  • FIG. 6 (a) depicts an example data structure of a message from RNC to RN.
  • FIG. 6 (b) depicts an example data structure of a message from RN-BIO-SC to RLM.
  • FIG. 3 illustrates a 1xEV-DO Radio Access Network (RAN) 300. The RAN 300 can be built entirely on IP technology, all the way from an AT 305 to a network connection to the Internet (e.g., via a RNC 310), thus taking full advantage of the scalability, redundancy, and low-cost of IP networks. The entire service area of a wireless access provider may comprise one or more IP RANs 300. Each IP RAN 300 can include many radio nodes (RNs), e.g., RN 315 and RN 320, and one or more radio network controllers (RNC), e.g., 310. The RNs 315 and 320 and the RNC 310 are connected over an IP (backhaul) network 330, which supports many-to-many connectivity between RNs 315 and 320 and RNC 310, and any other RNs and RNCs that may be part of RAN 300.
  • In presence of an IP connectivity between RNs 315 and 320 and RNC 310, transmission of PCT values as IP packets over IP backhaul 330 to connections on all RNs can generate a high amount of signaling message transmission. Each RNC could potentially support 100s of RNs and the signaling message overhead for PCT message transmission could be a significant portion of the overall backhaul traffic. System 300 implements a distributed approach to reduce the signaling messaging over IP backhaul 330, as described in more detail below, since signaling messaging has priority over data, which can cause significant reduction of data throughput to the end user.
  • In system 300, the RLOLPC functionality (e.g., updating the PCT) is distributed across RNs 315 and 320 and RNC 310. This distribution is accomplished by using a RLOLPC-RNC module 335 for RLOLPC functionality in RNC 310 and a RLOLPC-RN module 340 for RLOLPC functionality in RNs 315 and 320.
  • In a general overview, system 300 uses RLOLPC-RNC module 335 or RLOLPC-RN module 340 based on the handoff state of AT 305. In general, handoff represents the migration of a connection of AT 305 from one RN to another RN. When AT 305 is in communication with only one RN, for example RN 315, then AT 305 is not in handoff. When AT 305 migrates, for example, from RN 315 to RN 320, then AT 305 is in handoff. Soft handoff represents the overlapping coverage area of RNs 315 and 320, where AT 305 can communicate with both RN 315 and RN 320 at the same time. A soft handoff is sometimes referred to as a make before break connection. Softer handoff represents the overlapping coverage area between different sectors for the same RN.
  • If the AT 305 is not in handoff or is in softer handoff, the RLOLPC-RN module 340 of the serving RN handles the RLOLPC functionality. For example, if AT 305 is in communication only with RN 315 or is in a coverage area of RN 315 where AT 305 can communicate with multiple sectors of RN 315, then the RLOLPC-RN module 340 of the RN 315 handles the RLOLPC functionality. As described above, the RLOLPC algorithm increases or decreases the PCT value based on whether the reverse link receives good or bad frame input. The RLOLPC-RN module 340 can determine bad or good frame input locally at the RN 315 by using the CRC state. Because system 300 is a 1xEV-DO system, there is no quality metric assigned to each received packet. Since the packet of data is either good or bad, the CRC state indicates the usefulness of the packet. In this scenario, the RLILPC 350 receives the PCT locally (shown by arrow 355) and not from the RNC 310 (shown by arrow 360). Because no information has to be transferred between RN 315 and RNC 310, this local PCT calculation advantageously generates bandwidth savings on both reverse and forward links in backhaul 330. Also, there is a saving of processor bandwidth in RNC 310, since it does not have to execute an RLOLPC algorithm for this connection.
  • If the AT 305 is in soft handoff, the RLOLPC-RNC module 335 of the serving RNC handles the RLOLPC functionality. For example, if AT 305 is in communication with both RN 315 and RN 320, then the RLOLPC-RNC module 335 of the RNC 310 handles the RLOLPC functionality. In this scenario, like the scenario above, the RN (e.g., 315 and/or 320) receiving the packet determines whether it is a good or bad frame using the CRC state. If the RN (e.g., 315 and/or 320) determines the packet is a good frame, the RN forwards the packet to RNC 310. If the RN (e.g., 315 and/or 320) determines the packet is a bad frame, the RN does not forward the packet to RNC 310. Instead, the packet is dropped at the RN and an indication of a bad frame is sent to RNC 310. This indication is smaller than sending the entire received packet, hence less traffic is generated on the backhaul 330.
  • An SDU in RNC 310 determines which leg (e.g., the communication between AT 305 and RN 315 or the communication between AT 305 and RN 320) is providing the good frame, if any, and inputs the RLOLPC-RNC module 335 accordingly. The RLOLPC-RNC module 335 generates the PCT and sends it to the applicable RNs using, for example, a packet. The PCT packet may be treated as a signaling packet and sent using a signaling path, (e.g., using Transmission Control Protocol (TCP)). This signaling path can be slower but more reliable than the data traffic path. In another example, the PCT packet can be treated as a data packet and sent using a data traffic path (e.g., using User Datagram Protocol (UDP) or Generic Route Encapsulation (GRE) protocol). This data traffic path can be faster but less reliable than the signaling path. For each RN, the PCT for all connections on each carrier in that RN can be multiplexed into one packet and sent to the respective RN. Also, the PCT values for all of the RNs can be multiplexed into one packet and multicast to all of the RNs. These examples of using a single packet advantageously saves bandwidth on the forward link of the backhaul 330. Sending only a bad frame indication instead of the entire bad frame with appropriate markings advantageously generates bandwidth savings on the backhaul 330. Also, there is a saving of processor bandwidth in the RNs since the RLOLPC-RN module 340 is not run for this connection.
  • System 300 coordinates RLOLPC between the RLOLPC-RNC module 335 and the RLOLPC-RN module 340 for PCT input into the RLILPC 350 as the connection (with AT 305) enters handoff or exits handoff. System 300 coordinates RLOLPC in a number of ways. One way to coordinate RLOLPC is to transition the RLOLPC from RN to RNC and back to RN as connection (with AT 305) enters and exists handoff and to synchronize the RLOLPC to generate the same PCT while RLOLPC is transitioned.
  • To start the description of this process, the AT 305 is not in handoff and is communicating with RNC 310 only through RN 315. At some point, as AT 305 moves closer to RN 320, AT 305 enters an area where AT 305 can communicate with RNC 310 through both RN 315 and RN 320 (a soft handoff condition). Once RNC 310 detects this condition, which requires the connection to enter into handoff, the RNC 310 requests the channel-element resources from target RN 320 and has to update the source RN 315 with the number of legs in the handoff (in this case 2). During these transactions, source RN 315 responds with the latest value of PCT to initialize the RLOLPC-RNC module 335 in RNC 335. During resource allocation on target RN, the RNC 335 uses this PCT value to prime the target RN RLILPC 350. Once initialized, the RLOLPC-RNC module 335 determines the PCT and transmits the value to the RNs 315 and 320 s described above. This transmission of the PCT from the RLOLPC-RN 340 to the RLOLPC-RNC 335 enables the RLOLPC-RNC 335 to become synchronized with the RLOLPC-RN 340. The RLOLPC-RNC 335 can then take over the RLOLPC functionality seamlessly from the RLOLPC-RN 340. Once RNC detects the condition that AT needs to leave the handoff state, it has to update the last remaining leg with the number of handoff legs. The latest value of PCT can be also sent to RN at this time, before the periodic update time. Once the RN receives the above message, the RN switches to run RLOLPC (using the RLOLPC-RN 340) and generates the PCT locally (e.g., at the RN) for this connection.
  • Another way to coordinate RLOLPC is to simultaneously run RLOLPC in both RLOLPC-RN 340 and RLOLPC-RNC 335. Unlike the above examples, in this scenario, the RNs send a bad frame indication to the RNC 310, even when in a no handoff state, because RLOLPC-RNC 335 continuously calculates PCT, regardless of the handoff state. In this way, both RLOLPC-RN 340 and RLOLPC-RNC 335 are synchronized with each other. When, however, the AT 305 is in a no handoff or softer handoff state, RNC 310 does not transmit its PCT value to the RNs. RNs 315 and 320 are configured such that when they do not receive a PCT value from the RNC 310 they use the PCT value calculated by the RLOLPC-RN module 340. When the AT 305 moves into a soft handoff state, RNC 310 starts transmitting the PCT value calculated by RLOPC-RNC module 335. When the RNs 315 and 320 receive a PCT value from the RNC 310, they use that received PCT value instead of their locally calculated value. In other words, a PCT value received from the RNC 310 overwrites, or has higher priority than, the PCT value calculated by the local RLOLPC-RN module 340.
  • In some examples, the updated PCT is computed immediately after reception of the FCS information. However, since RLOLPC is a slow control loop, other examples input the PCT value to a RN modem receiver only once every ‘N’ RL frames. N represents a configurable parameter. In one example, N is set to 4 RL frames. Typically, each 1x-EVDO RL frame duration is 26.66 ms (see e.g., CDMA2000 High Data Rate
  • Packet Data Air Interface Specification, 3GPP2 C.S0024, Version 4.0, Oct. 25, 2002) and hence an update period where N is set to 4 is 106.64 ms. This characteristic of the RLOLPC algorithm also facilitates transmission of consolidated PCT messages as opposed to individual PCT messages from RNC 310 (e.g., single PCT packets described above).
  • FIGS. 4 and 5 illustrate the modules of RN 315 and RNC 310 in more detail. The modules that are running on RN 315 are shown in FIG. 4. The modules that are running on RNC 310 are shown in FIG. 5. In one example, the power control function at RN 315 is distributed across a BIO-SC 515 and modem line cards. The modem line card contains both a FLM module 440 and a RLM module 435. In one example, the power control function at the RNC 310 resides on a RNSM card 540.
  • In the illustrated example, the inner loop power control module (RLILPC) 405 exists in a modem receiver 410 of the RN 315. In the distributed approach for reverse link power control described above, the RLOLPC functionality is distributed across RNs and RNC based on all different handoff scenarios of the mobile (e.g., AT 305). In describing FIGS. 4-6, the following handoff scenarios will be used, and referred to using its respective preceding letter.
  • (a) Connection (AT) is not in hand-off.
  • (b) Connection (AT) is in softer hand-off but not in soft hand-off.
  • (c) Connection (AT) is in softer and soft hand-off
  • (d) Connection (AT) is in soft hand-off.
  • Handoff areas are located at the cell site boundaries. As described above, an AT 305 is said to be in ‘soft’ handoff if the AT 305 is able to see pilot signals from multiple RNs (e.g., both RN 315 and RN 320). An AT 305 is said to be in ‘softer’ handoff if the AT is able to see pilot signals from multiple sectors of a single RN. The AT 305 reports the pilots seen to the AN (e.g., RAN 300) as part of the route update message (see e.g., CDMA2000 High Data Rate Packet Data Air Interface Specification, 3GPP2 C.S0024, Version 4.0, Oct. 25, 2002). At the AN, a determination of whether the AT 305 is in no/soft/softer handoff is made based on the number of pilots and corresponding PN offsets. For example: An AT is said to be in ‘three-way’ soft handoff if the AN resolves PN offsets of the three pilots reported in the route update message that corresponds to the three different RNs. For example, if the system is compliant with CDMA2000 High Data Rate Packet Data Air Interface Specification, 3GPP2 C.S0024, Version 4.0, dated Oct. 25, 2002, the maximum number of pilots allowed in soft/softer handoff is 6. The number of pilots in soft handoff is referred to as the “soft handoff count”. During connection establishment, the RNC call control module 505 passes Soft Handoff count down to its peer, a call control agent (CCA) module 510 on each RN in the handoff. This facilitates connection resource allocation at RNs.
  • As described above, the power control for softer handoff can be identical to the no hand-off since the received signals of a specific AT 305 from different sectors on the specific RN are combined before generating FCS on that specific RN. Hence, there is no RNC involvement for softer handoff.
  • The techniques described herein distinguish the fact that for situations (a) and (b), the updated PCT provided by RLOLPC-RN module 340 is sufficient without any necessity of RNC 310 communicating with a RN (e.g., RN 315). For situations (c) and (d), updated PCT from RLOLPC-RNC module 335 is sent to all RNs in the handoff (e.g., RN 315 and RN 320) and this overrides the updated PCT from the RLOLPC-RN 340.
  • Power control when AT is not in soft handoff
  • FIG. 4 illustrates portions of RN 315, highlighting power control operation for scenarios (a) and (b). A reverse link modem 435 receives signals transmitted by the AT 305. A received signal from the AT 305 is decoded and MAC packets are generated by the modem receiver. This is represented by a RL Decoder block 415. A RTCHMO block 420 receives FCS and reverse rate indication of the received RL frame. The FCS information is input to the RLOLPC-RN module 340 and the updated PCT is computed. Updated PCT is input to a Decision Module 425. Soft Handoff Count is a key parameter that is used by the Decision Module 425 to determine whether the AT 305 is in soft handoff. For no handoff or softer handoff, the value of Soft Handoff Count=1. In one example, this soft handoff count parameter is sent from the CCA 510 to a power control connection object module 430 at the RLM 435 during power control connection resource allocation.
  • A connection list scanner module 435 scans a linked list of all active connections on the RN 315. Entries to this list are added/deleted when a connection is opened/closed with an AT. The scan list is updated from interaction with the RN call control agent module 510. Updates from the call control agent 510 are based on messages from its peer RNC call control 505.
  • In one example, upon reception of a timing callbacks (e.g., 4 RL frames detected by RL frame timing callback module 440) the entire active connection list is scanned. For each connection, the decision module 425 chooses appropriate PCT depending on the soft handoff count value. In cases (a) and (b), Soft Handoff Count=1 and hence PCTRN is chosen (e.g., the PCT value calculated by the RLOLPC-RN module 340). This value is used as the current input to RLILPC 405.
  • Using the latest PCT value, the RLILPC algorithm 405 determines RPC bits and transmits them to the mobile 305 on a forward link MAC channel. Since there is no involvement of RNC signaling, delays on the backhaul 330 are minimized and bandwidth conserved, as described above. Minimization of delay from the time the updated PCT is determined to the time it is used by RLILPC advantageously offers better power control on the reverse link. This can also help improve capacity on the forward link for high data rate wireless systems.
  • Power Control when AT is in Soft Handoff
  • FIG. 5 illustrates portions of RNC 310 and RN 315, highlighting power control operation for scenarios (c) and (d). In these scenarios, the AT is power controlled from the RNC 310. An SDU algorithm 515 running on the RNC 310 processes FCS information received from all RNs that are involved in the soft hand-off and generates the consolidated FCS. If a good frame is received from at least one RN, then consolidated FCS is considered good. Bad FCS indication is generated if bad frames are received from all RNs.
  • The RLOLPC-RNC module 335 gets FCS information from the SDU 515 and determines adaptive PCT that satisfies the FER criterion (RL FER is a configurable parameter. See the description above about the soft handoff count parameter). This value is stored in the power control connection object 520 for the specific connection.
  • A connection list scanner module 525 scans the linked list of active connections that are in soft handoff. Entries to this list are added/deleted when an AT moves in and out of soft handoff. The scan list is updated from an interaction with the RNC call control module 505. Updates from the call control 505 are based on soft handoff count information.
  • Upon firing of a power control timer 530 (e.g., period=4 RL frames), the connection list is scanned. The RN-IP address and channel record 2-tuple uniquely identifies each RN. For each soft handoff leg (RN) in that connection, a PCT multiplexer 535 updates a consolidated PCT message with a new PCT. The structure of the consolidated PCT message is given in FIG. 6( a).
  • Once all connections in the list are scanned, PCT messages are transmitted to all RNs. In one example, for load balancing amongst competing tasks on the RNSM 540, the connection list scanner 525 scans only a subset of connections in the connection list. This scanning size can be a configurable parameter on the RNC 310 and in one example is set to 960.
  • In one example, the signaling PCT messages are sent to the RN 315 over the IP backhaul 330 using proprietary ABIS signaling protocol. In this example, there is no acknowledgement provided by RN 315 to RNC 310. PCT values are quasi real-time and hence acknowledgements/retransmissions are redundant if messages are lost or dropped on the backhaul 330.
  • For a received message at RN-BIO-SC 515, the PCT message remapper 545 strips out the BSCConnectionId and sends the received message to the appropriate RLM card 435. Contents of this message are illustrated in FIG. 6( b). PCT demultiplexer 445 located on the RLM 435 populates the appropriate power control connection object 430 with PCTRNC. For each connection, the decision module 425 chooses an appropriate PCT depending on the soft handoff count value. In scenarios (c) and (d), the soft handoff count>1 and hence PCTRNC is chosen. This value is written into the modem receiver and serves as current input to RLILPC 405.

Claims (22)

  1. 1. A method of performing reverse link power control in a mobile network having a plurality of first modem devices that receive and transmit signals to wireless access terminals (ATs) and a second device in communication with said plurality of first devices, said method comprising:
    deriving, by one of said first devices, a first power control threshold (PCT) value for reverse link power of one of said access terminals (ATs);
    deriving, by said second device, a second power control threshold (PCT) value for reverse link power of said one of said ATs;
    transmitting said second power control threshold (PCT) value using a data traffic path; and
    selecting said first PCT value or said second PCT value.
  2. 2. The method of claim 1 wherein transmitting comprises transmitting using User Datagram Protocol or Generic Route Encapsulation protocol.
  3. 3. The method of claim 1 wherein transmitting comprises transmitting said second power control threshold (PCT) value based on a state of a connection.
  4. 4. The method of claim 3 wherein said state of said connection comprises said connection in soft handoff.
  5. 5. The method of claim 1 wherein said second PCT value is selected when said second PCT value is received at said one of said first devices.
  6. 6. The method of claim 1 wherein said first PCT value is selected when a connection is not in handoff or a connection is in softer handoff.
  7. 7. The method of claim 1 wherein said second PCT value is selected when a connection is in soft handoff.
  8. 8. The method of claim 1 further comprising:
    generating, by said one of said first devices, an indicator representing quality of a signal received from said one of said ATs, and
    calculating said first PCT and said second PCT using said indicator.
  9. 9. The method of claim 1 further comprising:
    preventing transmission of a packet from said one of said first devices to said second device if said packet is associated with a bad indication; and
    transmitting said bad indication to said second device.
  10. 10. The method of claim 1 further comprising determining good or bad indication of a packet using a cyclic redundancy code (CRC) associated with said packet.
  11. 11. The method of claim 1 further comprising communicating between said first devices and said second device using Internet Protocol (IP) or asynchronous transfer mode (ATM).
  12. 12. A system for performing reverse link power control, said system comprising:
    a first modem device that receives and transmits signals to a wireless access terminal (AT), said first device configured to derive a first power control threshold (PCT) value for reverse link power of an AT; and
    a second device in communication with said first device over a network, said second device configured to derive a second power control threshold (PCT) value for reverse link power of said AT and to transmit said second power control threshold (PCT) value to said first device using a data traffic path.
  13. 13. The system of claim 12 wherein the first device is further configured to transmit said second power control threshold (PCT) value to said first device over said data traffic path using User Datagram Protocol or Generic Route Encapsulation protocol.
  14. 14. The system of claim 12 wherein the first device is further configured to select said first PCT value or said second PCT value.
  15. 15-21. (canceled)
  16. 22. A computer program product, tangibly embodied in an information carrier, for performing reverse link power control in a mobile network having a plurality of first modem devices that receive and transmit signals to wireless access terminals (ATs) and a second device in communication with said plurality of first devices, the computer program product including instructions being operable to cause data processing apparatus to:
    derive, by one of said first devices, a first power control threshold (PCT) value for reverse link power of one of said access terminals (ATs);
    derive, by said second device, a second power control threshold (PCT) value for reverse link power of said one of said ATs;
    transmit said second power control threshold (PCT) value using a data traffic path; and
    select said first PCT value or said second PCT value.
  17. 23. The computer program product of claim 22 further comprising instructions operable to cause the data processing apparatus to transmit using User Datagram Protocol or Generic Route Encapsulation protocol.
  18. 24. The computer program product of claim 22 further comprising instructions operable to cause the data processing apparatus to select said second PCT value when said second PCT value is received at said one of said first devices.
  19. 25. The computer program product of claim 22 further comprising instructions operable to cause the data processing apparatus to select said first PCT value when a connection is not in handoff or a connection is in softer handoff.
  20. 26. The computer program product of claim 22 further comprising instructions operable to cause the data processing apparatus to select said second PCT value when a connection is in soft handoff.
  21. 27. The computer program product of claim 22 further comprising instructions operable to cause the data processing apparatus to:
    generate, by said one of said first devices, an indicator representing quality of a signal received from said one of said ATs, and
    calculate said first PCT and said second PCT using said indicator.
  22. 28-30. (canceled)
US12955610 2004-04-28 2010-11-29 Reverse Link Power Control Abandoned US20110128851A1 (en)

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