WO2016095193A1 - Procédé de déclenchement de réduction de puissance, dispositif de station de base, dispositif d'utilisateur et système associés - Google Patents

Procédé de déclenchement de réduction de puissance, dispositif de station de base, dispositif d'utilisateur et système associés Download PDF

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Publication number
WO2016095193A1
WO2016095193A1 PCT/CN2014/094332 CN2014094332W WO2016095193A1 WO 2016095193 A1 WO2016095193 A1 WO 2016095193A1 CN 2014094332 W CN2014094332 W CN 2014094332W WO 2016095193 A1 WO2016095193 A1 WO 2016095193A1
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Prior art keywords
flow control
backoff
value
random access
msg3
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PCT/CN2014/094332
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English (en)
Chinese (zh)
Inventor
陈宝军
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华为技术有限公司
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Priority to CN201480033225.5A priority Critical patent/CN106165520B/zh
Priority to PCT/CN2014/094332 priority patent/WO2016095193A1/fr
Publication of WO2016095193A1 publication Critical patent/WO2016095193A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method for triggering backoff, a base station device, a user equipment, and a system.
  • the random access process plays a vital role in the modern communication system, and is a key step for the user equipment UE (User Equipment) to access the base station equipment eNB (Enhanced NodeB) to establish a communication connection.
  • the random access procedure accessed by multiple user equipments has competition and is therefore a random access procedure for competition.
  • the user equipment first sends a random access preamble (RAP) message to the base station device, and the base station device feeds back a random access response (RAR) message according to the random access preamble message.
  • RAP random access preamble
  • RAR random access response
  • the user equipment then sends a scheduled transmission ST (Scheduled Transmission) message to the base station device, and the base station device further feeds back a contention resolution CR (Contention Resolution) message according to the scheduling transmission message.
  • RAP random access preamble
  • RAR random access response
  • the user equipment then sends a scheduled transmission ST (Scheduled Transmission) message to the base station device, and the base station device
  • the user equipment If the user equipment does not receive the random access response RAR message fed back by the base station device, or the contention resolution fails, the user equipment performs a backoff mechanism, that is, retransmits the random access preamble message after delaying the backoff time. It should be noted that the user equipment determines the backoff time according to the backoff parameter value, and the backoff parameter value is obtained by mapping the backoff index. Further, the backoff index is randomly adopted by the base station device. The access response message is sent to the user equipment.
  • the Long Term Evolution (LTE) protocol in the 3rd Generation Partnership Project (3GPP) describes only the method for the base station device to send backoff parameters and the behavior of the user equipment to perform the backoff mechanism.
  • the retreat parameters are assigned to the equipment manufacturer.
  • the base station device adjusts the value of the backoff parameter according to the number of received random access preamble messages (which can be understood as a contention access load).
  • the solution does not take into account the processing capability of the base station device, that is, the backoff mechanism is not triggered when the base station device generates flow control. Since the flow control is not considered, the existing design method of the backoff parameter is not perfect, which affects the performance of the wireless communication system.
  • the embodiments of the present invention provide a method for triggering backoff, a base station device, a user equipment, and a system, which can adjust the backoff parameters according to the flow control status of the base station device, improve the success rate of the RRC connection or the reestablishment, and enhance the performance of the wireless communication system.
  • a first aspect of the embodiments of the present invention provides a method for triggering backoff, including:
  • contention access load is related to the number of random access preamble messages received on the physical random access channel
  • the acquiring a contention access load, where the contention access load is related to the number of random access preamble messages received on the physical random access channel includes:
  • the contention access load is equal to a ratio of the number of random access preamble messages to the specified number.
  • the performing, by the statistics, the random access preamble message received on a specified number of the physical random access channels The number includes:
  • the i is a natural number.
  • the acquiring the flow control status information, where the flow control status information is related to the number of the flow control MSG3, includes:
  • the quantity of the received MSG3 includes the following totals:
  • the number of flow control MSG3s including the following totals:
  • the flow control status information includes a high flow control condition or a low flow control condition
  • the adjusting the value of the backoff index according to the contention access load and the flow control status information includes:
  • the value of the backoff index is less than the maximum value of the backoff index, if the contention access load is higher than the contention access load upper limit, or the flow control status information is a high flow control condition, then Increasing the value of the backoff index;
  • the value of the backoff index is greater than the minimum value of the backoff index, if the contention access load is lower than the contention load load lower limit, or the flow control status information is a low flow control condition, then Decrease The value of the backoff index.
  • the maximum value of the backoff index is 12, and the minimum value of the backoff index is 0.
  • the sending, by the user equipment, the random access response message that carries the backoff index includes:
  • a second aspect of the embodiments of the present invention provides a method for triggering backoff, including:
  • a random access response message carrying a backoff index where the value of the backoff index is adjusted by the base station device according to the contention access load and the flow control status information, the contention access load and the
  • the base station device is related to the number of random access preamble messages received on the physical random access channel, where the flow control status information is related to the number of flow control MSG3s on the base station device;
  • the backoff is triggered according to the backoff time.
  • the contention access load is equal to the number of the random access preamble messages received by the base station device on the specified number of the physical random access channels, and the designation The ratio of the number.
  • the flow control status information is that the base station device has a flow control ratio upper limit value and a MSG3 flow control ratio lower limit according to the MSG3 flow control ratio respectively.
  • the magnitude relationship of the values is determined, and the flow control ratio is equal to a ratio of the number of MSGs of the flow control to the number of MSG3s received by the base station device.
  • the quantity of the received MSG3 includes the following totals:
  • the number of flow control MSG3s including the following totals:
  • the flow control status information includes a high flow control condition or a low flow control condition
  • the flow control status information is determined by the base station device in the following manner:
  • the value of the backoff index is determined by the base station device by:
  • the backoff index When the value of the backoff index is less than the maximum value of the backoff index, if the contention access load is higher than the contention load load upper limit, or the flow control status information is a high flow control condition, increase the The value of the backoff index;
  • the value of the backoff index is greater than the minimum value of the backoff index, if the contention access load is lower than the contention competition load lower limit, or the flow control status information is a low flow control condition, then the reduction is performed.
  • the value of the backoff index is greater than the minimum value of the backoff index, if the contention access load is lower than the contention competition load lower limit, or the flow control status information is a low flow control condition, then the reduction is performed. The value of the backoff index.
  • the maximum value of the backoff index is 12, and the minimum value of the backoff index is 0.
  • a third aspect of the embodiments of the present invention provides a base station device, including:
  • a load acquisition module configured to acquire a contention access load, where the contention access load is related to the number of random access preamble messages received on the physical random access channel;
  • An information obtaining module configured to acquire flow control status information, where the flow control status information is related to the number of MSG3s of the flow control;
  • An index adjustment module configured to adjust a value of the backoff index according to the contention access load and the flow control status information
  • the message sending module is configured to send a random access response message carrying the backoff index to the user equipment, so that the user equipment triggers the backoff according to the backoff index.
  • the load acquiring module includes:
  • a preamble statistics unit configured to count the number of the random access preamble messages received on the specified number of the physical random access channels
  • a load calculation unit configured to calculate the contention access load, where the contention access load is equal to a ratio of the number of the random access preamble messages to the specified number.
  • the preamble statistics unit is specifically configured to:
  • the i is a natural number.
  • the information acquiring module includes:
  • An MSG3 statistic unit configured to count the number of MSG3s received in a specified time period and the number of MSG3s of the flow control;
  • a ratio calculation unit configured to calculate a flow control ratio of the MSG3, where the flow control ratio is equal to a ratio of the number of MSG3s of the flow control to the number of the received MSG3s;
  • the threshold query unit is configured to query the upper limit value of the flow control ratio of the MSG3 and the lower limit value of the flow control ratio of the MSG3;
  • the information determining unit is configured to determine the flow control status information according to the magnitude relationship between the MSG3 flow control ratio and the MSG3 flow control ratio upper limit value and the MSG3 flow control ratio lower limit value.
  • the quantity of the received MSG3 includes the following total:
  • the number of flow control MSG3s including the following totals:
  • the flow control status information comprises a high flow control condition or a low flow control condition
  • the information determining unit is specifically configured to:
  • the exponential adjustment module includes:
  • a threshold query unit configured to query a contention access load upper limit value and a contention access load lower limit value, and a maximum value and a minimum value of the backoff index
  • An exponential increasing unit configured to: when the value of the backoff index is less than a maximum value of the backoff index, if the contention access load is higher than the contention limit of the contention access load, or the flow control status information For a high flow control condition, increase the value of the backoff index;
  • An exponential reducing unit configured to: when the value of the backoff index is greater than a minimum value of the backoff index, if the contention access load is lower than the contention load load lower limit, or the flow control status information For low flow control conditions, the value of the backoff index is reduced.
  • the maximum value of the backoff index is 12, and the minimum value of the backoff index is 0.
  • the message sending module is specifically configured to determine whether the value of the backoff index is 0, if not, The user equipment sends a random access response message carrying the backoff index.
  • a fourth aspect of the embodiments of the present invention provides a user equipment, including:
  • a message receiving module configured to receive a random access response message that is sent by the base station device and that carries a backoff index, where the value of the backoff index is adjusted by the base station device according to the contention access load and the flow control status information, where the competition is performed.
  • the access load is related to the number of random access preamble messages received by the base station device on the physical random access channel, where the flow control status information is related to the number of the flow control MSG3 on the base station device;
  • a time determining module configured to determine a backoff parameter value mapped by the backoff index, and randomly select a value between 0 and the backoff parameter value as a backoff time
  • the backoff triggering module is configured to trigger the backoff according to the backoff time.
  • the contention access load is equal to the number of the random access preamble messages received by the base station device on the specified number of the physical random access channels, and the designation The ratio of the number.
  • the flow control status information is that the base station device is in accordance with the MSG3 flow control ratio and the MSG3 flow control ratio upper limit value and the MSG3 flow control ratio lower limit respectively.
  • the magnitude relationship of the values is determined, and the flow control ratio is equal to a ratio of the number of MSGs of the flow control to the number of MSG3s received by the base station device.
  • the quantity of the received MSG3 includes the following totals:
  • the number of flow control MSG3s including the following totals:
  • the flow control status information includes a high flow control condition or a low flow control condition
  • the flow control status information is determined by the base station device in the following manner:
  • the value of the backoff index is determined by the base station device by:
  • the backoff index When the value of the backoff index is less than the maximum value of the backoff index, if the contention access load is higher than the contention load load upper limit, or the flow control status information is a high flow control condition, increase the The value of the backoff index;
  • the value of the backoff index is greater than the minimum value of the backoff index, if the competitive access load is low.
  • the value of the backoff index is decreased when the content of the load access lower limit value or the flow control status information is a low flow control condition.
  • the maximum value of the backoff index is 12, and the minimum value of the backoff index is 0.
  • a fifth aspect of the embodiments of the present invention provides a wireless communication system, where the wireless communication system includes the base station device provided by the third aspect, and the user equipment provided by the fourth aspect, where:
  • the base station device is configured to acquire a contention access load, where the contention access load is related to the number of random access preamble messages received on the physical random access channel, and acquire flow control status information, where the flow control status is The information is related to the number of the flow control MSG3; the value of the backoff index is adjusted according to the contention access load and the flow control status information; and the random access response message carrying the backoff index is sent to the user equipment, So that the user equipment triggers the backoff according to the backoff index;
  • the user equipment is configured to receive a random access response message that is sent by the base station device and carries a backoff index, where the value of the backoff index is adjusted by the base station device according to the contention access load and the flow control status information,
  • the contention access load is related to the number of random access preamble messages received by the base station device on the physical random access channel
  • the flow control status information is related to the number of the flow control MSG3 on the base station device
  • the value of the backoff parameter mapped by the backoff index and randomly selecting a value between 0 and the backoff parameter value as the backoff time; and triggering the backoff according to the backoff time.
  • a sixth aspect of the embodiments of the present invention provides a computer storage medium, where the computer storage medium stores a program, and the program includes some or all of the steps of the method for triggering backoff provided by the first aspect.
  • a seventh aspect of the embodiments of the present invention provides a computer storage medium, where the computer storage medium stores a program, and the program includes some or all of the steps of the method for triggering backoff provided by the second aspect.
  • An eighth aspect of the embodiments of the present invention provides a base station device, including: a processor, an antenna interface, and a memory, where a program is stored in the memory, and the processor is configured to call a process stored in the memory. Order, used to do the following:
  • contention access load is related to the number of random access preamble messages received on the physical random access channel
  • a ninth aspect of the embodiments of the present invention provides a user equipment, including: a processor, an antenna interface, and a memory, wherein the memory stores a set of programs, and the processor is configured to call a program stored in the memory, to perform the following operations:
  • a random access response message carrying a backoff index where the value of the backoff index is adjusted by the base station device according to the contention access load and the flow control status information, the contention access load and the
  • the base station device is related to the number of random access preamble messages received on the physical random access channel, where the flow control status information is related to the number of flow control MSG3s on the base station device;
  • the backoff is triggered according to the backoff time.
  • the base station device in the embodiment of the present invention adjusts the value of the backoff index according to the obtained contention access load and the flow control status information, where the contention access load is received on the physical random access channel.
  • the number of the random access preamble messages is related, and the flow control status information is related to the number of the flow control MSG3, and the random access response message carrying the backoff index is sent to the user equipment, and the user equipment triggers the backoff according to the backoff index, which can be improved.
  • the success rate of RRC connection or re-establishment enhances the performance of the wireless communication system.
  • FIG. 1 is a schematic flowchart of a method for triggering backoff according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of another method for triggering backoff according to an embodiment of the present invention.
  • FIG. 3 is a schematic flowchart of still another method for triggering backoff according to an embodiment of the present invention.
  • FIG. 4 is a schematic flowchart of still another method for triggering backoff according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a base station device according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of a load acquisition module according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of an information acquiring module according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of an index adjustment module according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a wireless communication system according to an embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of another base station device according to an embodiment of the present disclosure.
  • FIG. 12 is a schematic structural diagram of another user equipment according to an embodiment of the present disclosure.
  • FIG. 13 is a schematic diagram of a contention random access procedure according to an embodiment of the present invention.
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD LTE Time Division Duplex
  • a user equipment may be referred to as a terminal (Mobile), a mobile station ("MS” for short) or a mobile terminal (Mobile Terminal). And so on, the user equipment can communicate with one or more core networks via a Radio Access Network (“RAN”), for example, the user equipment can be a mobile phone (or “cellular” phone) Or a computer having a mobile terminal, etc., for example, the user equipment is also It can be a portable, pocket, handheld, computer built-in or in-vehicle mobile device that exchanges voice and/or data with a wireless access network.
  • the base station may be an evolved base station (Evolutional Node B, referred to as "eNB”) in LTE.
  • eNB evolved base station
  • the LTE system is taken as an example to introduce the contention random access procedure.
  • the random access procedure of the competition is a random access procedure in which multiple user equipments compete for access.
  • FIG. 13 is a schematic diagram of a contention of a random access procedure, where the process is divided into four steps: Step 1: A plurality of user equipments send a random access preamble (RAP) message to the base station device; In the second step, the base station device sends a random access response (RAR) message to each user equipment. In step 3, the user equipment sends a scheduled transmission ST (Scheduled Transmission) message to the base station device through the MSG3.
  • RAP random access preamble
  • RAR random access response
  • the user equipment sends a scheduled transmission ST (Scheduled Transmission) message to the base station device through the MSG3.
  • RRC Radio Resource Control
  • MSG3 including consent and rejection
  • contention conflict for example, two or more user equipments send The random access preamble messages have the same resources, causing conflicts).
  • the backoff mechanism is performed, that is, the random access preamble message is resent after the backoff time is delayed.
  • the user equipment randomly selects a value as a backoff time with an equal probability between 0 and a backoff parameter value.
  • the backoff parameter value is obtained by mapping a backoff index, wherein the mapping relationship between the backoff parameter value and the backoff index can be as shown in Table 1. Further, the backoff index is sent by the base station device to the user equipment by using a random access response message.
  • FIG. 1 is a schematic flowchart of a method for triggering backoff according to an embodiment of the present invention.
  • the flow of the method for triggering backoff in this embodiment as shown in the figure may include:
  • the physical random access channel is the channel that the user equipment first accesses when initiating a call, and then establishes an RRC connection according to the indication of the base station device, which is the key of the call process.
  • the manner in which the base station device obtains the contention of the competition access can be implemented by the following two steps:
  • Step 1 Count the number of random access preamble messages received on the specified number of physical random access channels.
  • the base station device can use the sliding window statistics to count the number of random access preamble messages received on the PrachStatNum physical random access channels, as follows:
  • Step 2 Calculate the contention access load, and the contention access load is equal to the ratio of the number of random access preamble messages to the specified number.
  • the contention access load ConPreambleNum/PrachStatNum.
  • the manner in which the base station device obtains the flow control status information can be implemented in the following four steps:
  • Step 1 Count the number of MSG3s received in the specified time period and the number of MSG3s in the flow control.
  • the number of MSG3s received by the base station device includes the following totals:
  • the number of MSG3s that are controlled by the base station device flow includes the following totals:
  • the specified time period is represented by the parameter FlowCtrlStatPeriod
  • the value of the FlowCtrlStatPeriod can be preset by the designer.
  • the number of received MSG3 is represented by the parameter ReceiveMsg3Num
  • the number of MSG3 of the flow control is represented by the parameter FlowCtrlMsg3Num.
  • Step 2 Calculate a flow control ratio of the MSG3, where the flow control ratio is equal to a ratio of the number of MSG3s of the flow control to the number of received MSG3s.
  • the MSG3 flow control ratio is FlowCtrlMsg3Num/ReceiveMsg3Num.
  • Step 3 Query the MSG3 flow control ratio upper limit value and the MSG3 flow control ratio lower limit value.
  • the MSG3 flow control ratio upper limit value is represented by the parameter FlowCtrlMsg3HighRatio
  • the MSG3 flow control ratio lower limit value is represented by the parameter FlowCtrlMsg3LowRatio, wherein the values of the FlowCtrlMsg3HighRatio and the FlowCtrlMsg3LowRatio can be preset by the designer.
  • Step 4 Determine the flow control status information according to the relationship between the MSG3 flow control ratio and the MSG3 flow control ratio upper limit value and the MSG3 flow control ratio lower limit value.
  • the flow control status information is determined to be a high flow control condition; if the flow control status of the MSG3 is lower than the lower limit of the flow control ratio of the MSG3, the flow is determined.
  • the control status information is a low flow control condition.
  • the flow control status information is represented by a parameter FlowCtrlMSG3Sign, and the value is -1, 0 or 1.
  • the base station equipment first queries the upper limit of the contention of the competitive access load and the lower limit of the competitive access load, and the maximum and minimum values of the backoff index, and then execute:
  • the value of the backoff index is less than the maximum value of the backoff index, if the contention access load is higher than the upper limit of the contention access load, or the flow control status information is a high flow control condition, the value of the backoff index is increased;
  • the value of the backoff index is greater than the minimum value of the backoff index, if the contention access load is lower than the lower limit of the contention access load, or the flow control status information is a low flow control condition, the value of the backoff index is decreased.
  • the maximum value of the backoff index is set to 12 according to the description in the 3GPP protocol, and the minimum value of the set backoff index is 0.
  • the competition access load upper limit value is represented by a parameter ConRaloadHighThd
  • the contention limit load lower limit value is represented by a parameter ConRaloadLowThd
  • the values of ConRaloadHighThd and ConRaloadLowThd can be preset by a designer.
  • the base station device determines whether the value of the backoff index is 0. If not, the base station device sends a random access response message carrying the backoff index, that is, a random access response message filled with the backoff index field.
  • the user equipment receives the random access response message that is sent by the base station device and carries the backoff index, and then determines the backoff parameter value mapped by the backoff index, and the probability is between 0 and the backoff parameter value.
  • a value is randomly selected as the backoff time, and finally the backoff is triggered according to the backoff time.
  • the base station device in the embodiment of the present invention adjusts the value of the backoff index according to the obtained contention access load and the flow control status information, where the contention access load is received on the physical random access channel.
  • the number of the random access preamble messages is related, and the flow control status information is related to the number of the flow control MSG3, and the random access response message carrying the backoff index is sent to the user equipment, and the user equipment triggers the backoff according to the backoff index, which can be improved.
  • the success rate of RRC connection or re-establishment enhances the performance of the wireless communication system.
  • FIG. 2 is a schematic flowchart of another method for triggering backoff in the embodiment of the present invention, which may include:
  • the physical random access channel is the channel that the user equipment first accesses when initiating a call, and then establishes an RRC connection according to the indication of the base station device, which is the key of the call process.
  • the base station device can use the sliding window statistics manner to count the number of random access preamble messages received on the PrachStatNum physical random access channels, as follows:
  • a sliding window is created; then, in the i-th sliding window, the random connections received on the i-th to i-th + PrachStatNum-1 physical random access channels are counted.
  • contention access load ConPreambleNum/PrachStatNum.
  • the number of MSG3s received by the base station device includes the following totals:
  • the number of MSG3s that are controlled by the base station device flow includes the following totals:
  • the specified time period is represented by the parameter FlowCtrlStatPeriod
  • the value of the FlowCtrlStatPeriod can be preset by the designer.
  • the number of received MSG3 is represented by the parameter ReceiveMsg3Num
  • the number of MSG3 of the flow control is represented by the parameter FlowCtrlMsg3Num.
  • the MSG3 flow control ratio FlowCtrlMsg3Num/ReceiveMsg3Num.
  • S205 Query the upper limit value of the flow control ratio of the MSG3 and the lower limit value of the flow control ratio of the MSG3.
  • the MSG3 flow control ratio upper limit value is represented by the parameter FlowCtrlMsg3HighRatio
  • the MSG3 flow control ratio lower limit value is represented by the parameter FlowCtrlMsg3LowRatio, wherein the values of the FlowCtrlMsg3HighRatio and the FlowCtrlMsg3LowRatio can be preset by the designer.
  • the flow control status information is determined to be a high flow control status; if the flow control status of the MSG3 is lower than the lower limit of the flow control ratio of the MSG3, the flow control status is determined.
  • the information is in a low flow control situation.
  • the flow control status information is represented by a parameter FlowCtrlMSG3Sign, and the value is -1, 0 or 1.
  • the base station device first queries the upper limit value of the contention access load and the lower limit value of the contention access load, and the maximum and minimum values of the backoff index, and then executes:
  • the value of the backoff index is less than the maximum value of the backoff index, if the contention access load is higher than the upper limit of the contention access load, or the flow control status information is a high flow control condition, the value of the backoff index is increased;
  • the value of the backoff index is greater than the minimum value of the backoff index, if the contention access load is lower than the lower limit of the contention access load, or the flow control status information is a low flow control condition, the value of the backoff index is decreased.
  • the maximum value of the backoff index is set to 12 according to the description in the 3GPP protocol, and the minimum value of the set backoff index is 0.
  • the competitive access load upper limit is represented by a parameter ConRaloadHighThd.
  • the value of the competitive access load lower limit value is represented by the parameter ConRaloadLowThd, wherein the values of ConRaloadHighThd and ConRaloadLowThd can be preset by the designer.
  • the base station device determines whether the value of the backoff index is 0. If not, the base station device sends a random access response message carrying the backoff index, that is, a random access response message filled with the backoff index field.
  • the user equipment receives the random access response message that is sent by the base station device and carries the backoff index, determines the backoff parameter value mapped by the backoff index, and randomly selects a value between 0 and the backoff parameter value as the backoff time. Finally, the backoff is triggered according to the backoff time.
  • the base station device in the embodiment of the present invention adjusts the value of the backoff index according to the obtained contention access load and the flow control status information, where the contention access load is received on the physical random access channel.
  • the number of the random access preamble messages is related, and the flow control status information is related to the number of the flow control MSG3, and the random access response message carrying the backoff index is sent to the user equipment, and the user equipment triggers the backoff according to the backoff index, which can be improved.
  • the success rate of RRC connection or re-establishment enhances the performance of the wireless communication system.
  • FIG. 3 is a schematic flowchart of another method for triggering backoff in an embodiment of the present invention, which may include:
  • the base station device acquires a contention access load, where the contention access load is related to the number of random access preamble messages received on the physical random access channel.
  • the physical random access channel is a channel that is first accessed when the user equipment initiates a call, and then establishes an RRC connection according to the indication of the base station device. It is the key to the calling process.
  • the manner in which the base station device obtains the contention of the competition access can be implemented by the following two steps:
  • Step 1 Count the number of random access preamble messages received on the specified number of physical random access channels.
  • the base station device can use the sliding window statistics to count the number of random access preamble messages received on the PrachStatNum physical random access channels, as follows:
  • a sliding window is created; then, in the i-th sliding window, the random connections received on the i-th to i-th + PrachStatNum-1 physical random access channels are counted.
  • Step 2 Calculate the contention access load, and the contention access load is equal to the ratio of the number of random access preamble messages to the specified number.
  • the contention access load ConPreambleNum/PrachStatNum.
  • the base station device acquires flow control status information, where the flow control status information is related to the number of flow control MSG3s.
  • the manner in which the base station device obtains the flow control status information can be implemented in the following four steps:
  • Step 1 Count the number of MSG3s received in the specified time period and the number of MSG3s in the flow control.
  • the number of MSG3s received by the base station device includes the following totals:
  • the number of MSG3s that are controlled by the base station device flow includes the following totals:
  • the specified time period is represented by the parameter FlowCtrlStatPeriod
  • the value of the FlowCtrlStatPeriod can be preset by the designer.
  • the number of received MSG3 is represented by the parameter ReceiveMsg3Num
  • the number of MSG3 of the flow control is represented by the parameter FlowCtrlMsg3Num.
  • Step 2 Calculate a flow control ratio of the MSG3, where the flow control ratio is equal to a ratio of the number of MSG3s of the flow control to the number of received MSG3s.
  • the MSG3 flow control ratio is FlowCtrlMsg3Num/ReceiveMsg3Num.
  • Step 3 Query the MSG3 flow control ratio upper limit value and the MSG3 flow control ratio lower limit value.
  • the MSG3 flow control ratio upper limit value is represented by the parameter FlowCtrlMsg3HighRatio
  • the MSG3 flow control ratio lower limit value is represented by the parameter FlowCtrlMsg3LowRatio, wherein the values of the FlowCtrlMsg3HighRatio and the FlowCtrlMsg3LowRatio can be preset by the designer.
  • Step 4 Determine the flow control status information according to the relationship between the MSG3 flow control ratio and the MSG3 flow control ratio upper limit value and the MSG3 flow control ratio lower limit value.
  • the flow control status information is determined to be a high flow control condition; if the flow control status of the MSG3 is lower than the lower limit of the flow control ratio of the MSG3, the flow is determined.
  • the control status information is a low flow control condition.
  • the flow control status information is represented by a parameter FlowCtrlMSG3Sign, and the value is -1, 0 or 1.
  • FlowCtrlMSG3Sign -1 indicates a low flow control condition
  • the base station device adjusts a value of the backoff index according to the contention access load and the flow control status information.
  • the base station equipment first queries the upper limit of the contention of the competitive access load and the lower limit of the competitive access load, and the maximum and minimum values of the backoff index, and then execute:
  • the value of the backoff index is less than the maximum value of the backoff index, if the contention access load is higher than the upper limit of the contention access load, or the flow control status information is a high flow control condition, the value of the backoff index is increased;
  • the value of the backoff index is greater than the minimum value of the backoff index, if the contention access load is lower than the lower limit of the contention access load, or the flow control status information is a low flow control condition, the value of the backoff index is decreased.
  • the maximum value of the backoff index is set to 12 according to the description in the 3GPP protocol, and the minimum value of the set backoff index is 0.
  • the competition access load upper limit value is represented by a parameter ConRaloadHighThd
  • the contention limit load lower limit value is represented by a parameter ConRaloadLowThd
  • the values of ConRaloadHighThd and ConRaloadLowThd can be preset by a designer.
  • the base station device sends a random access response message carrying the backoff index to the user equipment.
  • the base station device determines whether the value of the backoff index is 0. If not, the base station device sends a random access response message carrying the backoff index, that is, a random access response message filled with the backoff index field.
  • the user equipment receives a random access response message that is sent by the base station device and carries a backoff index.
  • the user equipment determines a backoff parameter value mapped by the backoff index, and randomly selects a value between 0 and the backoff parameter value as a backoff time.
  • the user equipment may determine the value of the backoff parameter mapped by the backoff index according to the mapping relationship of Table 1, and details are not described herein again.
  • the user equipment triggers the backoff according to the backoff time.
  • the user equipment after delaying the backoff time, the user equipment sends the random access preamble message to the base station device again.
  • the base station device in the embodiment of the present invention adjusts the value of the backoff index according to the obtained contention access load and the flow control status information, where the contention access load is received on the physical random access channel.
  • the number of the random access preamble messages is related, and the flow control status information is related to the number of the flow control MSG3, and the random access response message carrying the backoff index is sent to the user equipment, and the user equipment triggers the backoff according to the backoff index, which can be improved.
  • the success rate of RRC connection or re-establishment enhances the performance of the wireless communication system.
  • FIG. 4 is a schematic flowchart of another method for triggering backoff in an embodiment of the present invention, which may include:
  • the base station device counts the number of random access preamble messages received on the specified number of physical random access channels.
  • the physical random access channel is a channel that is first accessed when the user equipment initiates a call, and then establishes an RRC connection according to the indication of the base station device. It is the key to the calling process.
  • the base station device can use the sliding window statistics manner to count the number of random access preamble messages received on the PrachStatNum physical random access channels, as follows:
  • a sliding window is created; then, in the i-th sliding window, the random connections received on the i-th to i-th + PrachStatNum-1 physical random access channels are counted.
  • the base station device calculates a contention access load, where the contention access load is equal to a ratio of the number of the random access preamble messages to the specified number.
  • contention access load ConPreambleNum/PrachStatNum.
  • the base station device collects the number of MSG3s received in the specified time period and the number of MSG3s of the flow control.
  • the number of MSG3s received by the base station device includes the following totals:
  • the number of MSG3s that are controlled by the base station device flow includes the following totals:
  • the specified time period is represented by the parameter FlowCtrlStatPeriod, and the value of the FlowCtrlStatPeriod can be preset by the designer.
  • the number of received MSG3 is represented by the parameter ReceiveMsg3Num, which is represented by the parameter FlowCtrlMsg3Num.
  • the base station device calculates a flow control ratio of the MSG3, where the flow control ratio is equal to a ratio of the number of MSG3s of the flow control to the number of the received MSG3.
  • the MSG3 flow control ratio FlowCtrlMsg3Num/ReceiveMsg3Num.
  • the base station device queries the MSG3 flow control ratio upper limit value and the MSG3 flow control ratio lower limit value.
  • the MSG3 flow control ratio upper limit value is represented by the parameter FlowCtrlMsg3HighRatio
  • the MSG3 flow control ratio lower limit value is represented by the parameter FlowCtrlMsg3LowRatio, wherein the values of the FlowCtrlMsg3HighRatio and the FlowCtrlMsg3LowRatio can be preset by the designer.
  • the base station device determines the flow control status information according to the magnitude relationship between the MSG3 flow control ratio and the MSG3 flow control ratio upper limit value and the MSG3 flow control ratio lower limit value.
  • the flow control status information is determined to be a high flow control status; if the flow control status of the MSG3 is lower than the lower limit of the flow control ratio of the MSG3, the flow control status is determined.
  • the information is in a low flow control situation.
  • the flow control status information is represented by a parameter FlowCtrlMSG3Sign, and the value is -1, 0 or 1.
  • the base station device adjusts a value of the backoff index according to the contention access load and the flow control status information.
  • the base station device first queries the upper limit value of the contention access load and the lower limit value of the contention access load, and the maximum and minimum values of the backoff index, and then executes:
  • the value of the backoff index is less than the maximum value of the backoff index, if the contention access load is higher than the upper limit of the contention access load, or the flow control status information is a high flow control condition, the value of the backoff index is increased;
  • the value of the backoff index is greater than the minimum value of the backoff index, if the contention access load is lower than the lower limit of the contention access load, or the flow control status information is a low flow control condition, the value of the backoff index is decreased.
  • the maximum value of the backoff index is set to 12 according to the description in the 3GPP protocol, and the minimum value of the set backoff index is 0.
  • the competition access load upper limit value is represented by a parameter ConRaloadHighThd
  • the contention limit load lower limit value is represented by a parameter ConRaloadLowThd
  • the values of ConRaloadHighThd and ConRaloadLowThd can be preset by a designer.
  • the base station device sends a random access response message carrying the backoff index to the user equipment.
  • the base station device determines whether the value of the backoff index is 0, and if not, to the user equipment.
  • a random access response message carrying a backoff index that is, a random access response message filled with a backoff index field, is sent.
  • the user equipment receives a random access response message that is sent by the base station device and carries a backoff index.
  • the user equipment determines a backoff parameter value mapped by the backoff index, and randomly selects a value between 0 and the backoff parameter value as a backoff time.
  • the user equipment may determine the value of the backoff parameter mapped by the backoff index according to the mapping relationship of Table 1, and details are not described herein again.
  • the user equipment triggers the backoff according to the backoff time.
  • the user equipment after delaying the backoff time, the user equipment sends the random access preamble message to the base station device again.
  • the base station device in the embodiment of the present invention adjusts the value of the backoff index according to the obtained contention access load and the flow control status information, where the contention access load is received on the physical random access channel.
  • the number of the random access preamble messages is related, and the flow control status information is related to the number of the flow control MSG3, and the random access response message carrying the backoff index is sent to the user equipment, and the user equipment triggers the backoff according to the backoff index, which can be improved.
  • the success rate of RRC connection or re-establishment enhances the performance of the wireless communication system.
  • FIG. 5 is a schematic structural diagram of a base station device according to an embodiment of the present invention.
  • the base station device in the embodiment of the present invention may include at least a load acquisition module 510, an information acquisition module 520, an index adjustment module 530, and a message sending module 540, where:
  • the load obtaining module 510 is configured to acquire a contention access load, where the contention access load is related to the number of random access preamble messages received on the physical random access channel.
  • the load obtaining module 510 may further include a preamble statistics unit 511 and a load calculation unit 512 as shown in FIG. 6, where:
  • the preamble statistics unit 511 is configured to count the number of the random access preamble messages received on the specified number of the physical random access channels.
  • the physical random access channel is a channel that is first accessed when the user equipment initiates a call, and then establishes an RRC connection according to the indication of the base station device. It is the key to the calling process.
  • the preamble statistics unit 511 can use the sliding window statistics manner to count the number of random access preamble messages received on the PrachStatNum physical random access channels, as follows:
  • a sliding window is created; then, in the i-th sliding window, the random connections received on the i-th to i-th + PrachStatNum-1 physical random access channels are counted.
  • the load calculation unit 512 is configured to calculate the contention access load, where the contention access load is equal to a ratio of the number of random access preamble messages to the specified number.
  • contention access load ConPreambleNum/PrachStatNum.
  • the information obtaining module 520 is configured to obtain flow control status information, where the flow control status information is related to the number of the flow control MSG3.
  • the information acquiring module 520 may further include an MSG3 statistic unit 521, a ratio calculating unit 522, a threshold query unit 523, and an information determining unit 524, as shown in FIG. 7, wherein:
  • the MSG3 statistic unit 521 is configured to count the number of MSG3s received in the specified time period and the number of MSG3s of the flow control.
  • the number of MSG3s received by the MSG3 statistics unit 521 includes the following totals:
  • the number of MSG3s flow controlled by the MSG3 statistic unit 521 includes the following totals:
  • the specified time period is represented by the parameter FlowCtrlStatPeriod
  • the value of the FlowCtrlStatPeriod can be preset by the designer.
  • the number of received MSG3 is represented by the parameter ReceiveMsg3Num
  • the number of MSG3 of the flow control is represented by the parameter FlowCtrlMsg3Num.
  • the ratio calculation unit 522 is configured to calculate a flow control ratio of the MSG3, where the flow control ratio is equal to a ratio of the number of MSG3s of the flow control to the number of the received MSG3.
  • the MSG3 flow control ratio FlowCtrlMsg3Num/ReceiveMsg3Num.
  • the threshold query unit 523 is configured to query the MSG3 flow control ratio upper limit value and the MSG3 flow control ratio lower limit value.
  • the MSG3 flow control ratio upper limit value is represented by the parameter FlowCtrlMsg3HighRatio
  • the MSG3 flow control ratio lower limit value is represented by the parameter FlowCtrlMsg3LowRatio, wherein the values of the FlowCtrlMsg3HighRatio and the FlowCtrlMsg3LowRatio can be preset by the designer.
  • the information determining unit 524 is configured to determine the flow control status information according to the magnitude relationship between the MSG3 flow control ratio upper limit value and the MSG3 flow control ratio lower limit value, respectively, according to the MSG3 flow control ratio.
  • the flow control status information is determined to be a high flow control status; if the flow control status of the MSG3 is lower than the lower limit of the flow control ratio of the MSG3, the flow control status is determined.
  • the information is in a low flow control situation.
  • the flow control status information is represented by a parameter FlowCtrlMSG3Sign, and the value is -1, 0 or 1.
  • the index adjustment module 530 is configured to adjust a value of the backoff index according to the contention access load and the flow control status information.
  • the index adjustment module 530 may further include a threshold query unit 531, an index increasing unit 532, and an exponential reducing unit 533 as shown in FIG. 8, wherein:
  • the threshold query unit 531 is configured to query a contention access load upper limit value and a contention access load lower limit value, and a maximum value and a minimum value of the backoff index.
  • the maximum value of the backoff index is set to 12 according to the description in the 3GPP protocol, and the minimum value of the set backoff index is 0.
  • the index increasing unit 532 is configured to: when the value of the backoff index is less than a maximum value of the backoff index, if the contention access load is higher than the contention limit of the contention access load, or the flow control status If the information is a high flow control condition, the value of the backoff index is increased.
  • the competition access load upper limit value is represented by a parameter ConRaloadHighThd
  • the contention limit load lower limit value is represented by a parameter ConRaloadLowThd
  • the values of ConRaloadHighThd and ConRaloadLowThd can be preset by a designer.
  • the index reducing unit 533 is configured to: when the value of the backoff index is greater than a minimum value of the backoff index, if the contention access load is lower than the contention load lower limit, or the flow control status If the information is a low flow control condition, the value of the backoff index is reduced.
  • the message sending module 540 is configured to send a random access response message carrying the backoff index to the user equipment, so that the user equipment triggers the backoff according to the backoff index.
  • the message sending module 540 determines whether the value of the backoff index is 0. If not, the random access response message carrying the backoff index, that is, the random access response message filled with the backoff index field, is sent to the user equipment.
  • the user equipment receives the random access response message that is sent by the base station device and carries the backoff index, determines the backoff parameter value mapped by the backoff index, and randomly selects a value between 0 and the backoff parameter value as the backoff time. Finally, the backoff is triggered according to the backoff time.
  • FIG. 9 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • the user equipment in the embodiment of the present invention may include at least a message receiving module 610, a time determining module 620, and a backoff triggering module 630, where:
  • the message receiving module 610 is configured to receive, by the base station device, a random access response message carrying a backoff index, where the value of the backoff index is adjusted by the base station device according to the contention access load and the flow control status information,
  • the contention access load is related to the number of random access preamble messages received by the base station device on the physical random access channel
  • the flow control status information is related to the number of flow control MSG3s on the base station device.
  • the contention access load is equal to a ratio of the number of random access preamble messages received by the base station device on the specified number of the physical random access channels to the specified number.
  • the flow control status information is determined by the base station device according to the relationship between the flow control ratio of the MSG3 and the upper limit value of the flow control ratio of the MSG3 and the lower limit value of the flow control ratio of the MSG3.
  • the flow control ratio is equal to the ratio of the number of MSGs of the flow control to the number of MSG3s received by the base station device.
  • the number of the received MSG3s includes the following totals:
  • the number of flow control MSG3s including the following totals:
  • the flow control status information includes a high flow control condition or a low flow control condition
  • the flow control status information is determined by the base station device in the following manner:
  • the value of the backoff index is determined by the base station device in the following manner:
  • the backoff index When the value of the backoff index is less than the maximum value of the backoff index, if the contention access load is higher than the contention load load upper limit, or the flow control status information is a high flow control condition, increase the The value of the backoff index;
  • the value of the backoff index is greater than the minimum value of the backoff index, if the contention access load is lower than the contention competition load lower limit, or the flow control status information is a low flow control condition, then the reduction is performed.
  • the value of the backoff index is greater than the minimum value of the backoff index, if the contention access load is lower than the contention competition load lower limit, or the flow control status information is a low flow control condition, then the reduction is performed. The value of the backoff index.
  • the maximum value of the backoff index is 12, and the minimum value of the backoff index is 0.
  • the time determining module 620 is configured to determine a backoff parameter value mapped by the backoff index, and randomly select a value between the 0 and the backoff parameter value as the backoff time.
  • the time determining module 620 can determine the value of the backoff parameter mapped by the backoff index according to the mapping relationship of Table 1, and details are not described herein again.
  • the backoff triggering module 630 is configured to trigger the backoff according to the backoff time.
  • the backoff triggering module 630 sends the random access preamble message to the base station device again after delaying the backoff time.
  • FIG. 10 is a schematic structural diagram of a wireless communication system according to an embodiment of the present invention, including the base station device 710 and the user equipment 720 as shown in FIG.
  • the base station device 710 is configured to acquire a contention access load, where the contention access load is related to the number of random access preamble messages received on the physical random access channel, and obtain flow control status information, where the flow control The status information is related to the number of the flow control MSG3; the value of the backoff index is adjusted according to the contention access load and the flow control status information; and the random access response carrying the backoff index is sent to the user equipment 720 a message, so that the user equipment 720 triggers the backoff according to the backoff index;
  • the user equipment 720 is configured to receive, by the base station device 710, a random access response message carrying a backoff index, where the value of the backoff index is determined by the base station device according to the contention access load and the flow control status information. Adjusting, the contention access load is related to the number of random access preamble messages received by the base station device on the physical random access channel, the flow control status information and the number of MSG3 flow control on the base station device Correlation; determining a backoff parameter value mapped by the backoff index, and randomly selecting a value between 0 and the backoff parameter value as a backoff time; and triggering backoff according to the backoff time.
  • FIG. 11 is a schematic structural diagram of another base station device according to an embodiment of the present invention.
  • the base station device may include: at least one processor 801, such as a CPU, at least one antenna interface 803, and a memory 804, at least one.
  • Communication bus 802. the communication bus 802 is used to implement connection communication between these components.
  • the memory 804 may be a high speed RAM memory or a non-volatile memory such as at least one disk memory.
  • the memory 804 may also be at least one storage device located away from the foregoing processor 801.
  • a set of program codes is stored in the memory 804, and the processor 801 is configured to call the program code stored in the memory 804 for performing the following operations:
  • contention access load is related to the number of random access preamble messages received on the physical random access channel
  • the processor 801 performs a process of acquiring a contention access load, where the contention related to the number of random access preamble messages received on the physical random access channel is:
  • the contention access load is equal to a ratio of the number of random access preamble messages to the specified number.
  • processor 801 perform statistics on the number of the random access preamble messages received on the specified number of the physical random access channels is:
  • the i is a natural number.
  • the processor 801 performs the process of acquiring the flow control status information, where the flow control status information is related to the number of the flow control MSG3:
  • the number of the received MSG3s includes the following totals:
  • the number of flow control MSG3s including the following totals:
  • the flow control status information includes a high flow control condition or a low flow control status
  • the processor 801 respectively controls the flow control ratio upper limit value and the MSG3 flow control according to the MSG3 flow control ratio.
  • the size of the lower limit value, the specific operation of determining the flow control status information is:
  • the processor 801 performs a specific operation of adjusting a value of the backoff index according to the contention access load and the flow control status information:
  • the value of the backoff index is less than the maximum value of the backoff index, if the contention access load is higher than the contention access load upper limit, or the flow control status information is a high flow control condition, then Increasing the value of the backoff index;
  • the value of the backoff index is greater than the minimum value of the backoff index, if the contention access load is lower than the contention load load lower limit, or the flow control status information is a low flow control condition, then The value of the backoff index is reduced.
  • the maximum value of the backoff index is 12, and the minimum value of the backoff index is 0.
  • the specific operation of the processor 801 to send the random access response message carrying the backoff index to the user equipment is:
  • the base station device introduced in this embodiment may be used to implement some or all of the steps of the method for triggering backoff described in conjunction with FIG. 1 to FIG. 4 in the embodiment of the present invention.
  • FIG. 12 is a schematic structural diagram of another user in the embodiment of the present invention.
  • the base station device may include: at least one processor 901, such as a CPU, at least one antenna interface 903, and a memory 904, at least one communication. Bus 902. Wherein, the communication bus 902 is used to implement these components Communication between the connections.
  • the memory 904 may be a high speed RAM memory or a non-volatile memory such as at least one disk memory.
  • the memory 804 may also be at least one storage device located away from the foregoing processor 901.
  • a set of program codes is stored in the memory 904, and the processor 901 is configured to call the program code stored in the memory 904 for performing the following operations:
  • a random access response message carrying a backoff index where the value of the backoff index is adjusted by the base station device according to the contention access load and the flow control status information, the contention access load and the
  • the base station device is related to the number of random access preamble messages received on the physical random access channel, where the flow control status information is related to the number of flow control MSG3s on the base station device;
  • the backoff is triggered according to the backoff time.
  • the base station device introduced in this embodiment may be used to implement some steps in the method for triggering backoff described in conjunction with FIG. 3 to FIG. 4 in the embodiment of the present invention.
  • the embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores a program, and the program includes a plurality of instructions for performing part of the method for triggering backoff described in the embodiments of the present invention. Or all the steps.
  • Another embodiment of the present invention further provides a computer storage medium, wherein the computer storage medium stores a program, and the program includes a plurality of instructions for performing the method of triggering backoff described in the embodiments of the present invention, as shown in FIG. 3 to FIG. Part of the steps.
  • the base station device in the embodiment of the present invention adjusts the value of the backoff index according to the obtained contention access load and the flow control status information, where the contention access load is received on the physical random access channel.
  • the number of the random access preamble messages is related, and the flow control status information is related to the number of the flow control MSG3, and the random access response message carrying the backoff index is sent to the user equipment, and the user equipment triggers the backoff according to the backoff index, which can be improved.
  • the success rate of RRC connection or re-establishment enhances the performance of the wireless communication system.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Abstract

Selon un mode de réalisation, la présente invention concerne un procédé permettant de déclencher un recul de puissance, le procédé consistant à : obtenir une charge d'accès à une compétition, la charge d'accès à une compétition étant liée au nombre de messages de préambule d'accès aléatoire reçus dans un canal d'accès aléatoire physique ; obtenir des informations de condition de commande de flux, les informations de condition de commande de flux étant liées au nombre de MSG3 de la commande de flux ; ajuster la valeur d'un indice de réduction de puissance en fonction de la charge d'accès à une compétition et des informations de condition de commande de flux ; et transmettre à un dispositif d'utilisateur un message de réponse d'accès aléatoire contenant l'indice de réduction de puissance de sorte que l'utilisateur déclenche la réduction de puissance en fonction de l'indice de réduction de puissance. Par conséquent, selon des modes de réalisation, la présente invention concerne également un dispositif de station de base, un dispositif d'utilisateur et un système de communication sans fil. Au moyen de la présente invention, un paramètre de réduction de puissance peut être ajusté en fonction de la condition de commande de flux du dispositif de station de base, le taux de réussite d'une connexion ou d'un rétablissement de RRC est augmenté et une performance de système de communication sans fil est améliorée.
PCT/CN2014/094332 2014-12-19 2014-12-19 Procédé de déclenchement de réduction de puissance, dispositif de station de base, dispositif d'utilisateur et système associés WO2016095193A1 (fr)

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