WO2008014708A1 - Procédé de régulation de charge et système correspondant d'une procédure à accès aléatoire - Google Patents

Procédé de régulation de charge et système correspondant d'une procédure à accès aléatoire Download PDF

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Publication number
WO2008014708A1
WO2008014708A1 PCT/CN2007/070343 CN2007070343W WO2008014708A1 WO 2008014708 A1 WO2008014708 A1 WO 2008014708A1 CN 2007070343 W CN2007070343 W CN 2007070343W WO 2008014708 A1 WO2008014708 A1 WO 2008014708A1
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WIPO (PCT)
Prior art keywords
load control
terminal device
value
load
probability value
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PCT/CN2007/070343
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English (en)
Chinese (zh)
Inventor
Mingxia Xu
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Huawei Technologies Co., Ltd.
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008014708A1 publication Critical patent/WO2008014708A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0289—Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0866—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a dedicated channel for access

Definitions

  • the present invention relates to load control techniques in wireless communication systems, and more particularly to a load control method and system in a random access process. Background of the invention
  • each terminal device can initiate access to the network side according to the user's will. Since this access is a completely random process, there is a possibility that more users simultaneously initiate access.
  • the network side usually monitors the load on the random access channel (RACH, Random Access Channel) and/or the traffic channel, and broadcasts the current load information or the load control information of the network through the system message.
  • the terminal device adjusts its own access process according to the information, thereby implementing load control.
  • the wireless communication system includes a system having a hard capacity characteristic and a system having a soft capacity characteristic from the viewpoint of whether the system capacity is variable.
  • a communication system having a hard capacity characteristic such as a Global System for Mobile Communication (GSM), the number of control channels and traffic channels, and the service level (GOS, Grade Of Service), etc.
  • GSM Global System for Mobile Communication
  • the parameter estimates the number of Irelands representing the system capacity.
  • the system capacity is somewhat flexible, and when the system is under high load, there is still a possibility of allowing new terminal devices to access.
  • the IXDO Evolution Data Only (EVDO) system can accommodate multiple terminal devices for simultaneous communication when the signal-to-noise ratio is acceptable.
  • the capacity is changeable; for orthogonal frequency division multiplexing (OFDM, Orthogonal Frequency Division)
  • OFDM Orthogonal Frequency Division
  • the network side since the network side can schedule different terminal devices to different time-frequency resource blocks and can perform such scheduling periodically, the capacity of the system is also not fixed. It can be seen that the load control of a communication system with soft capacity characteristics is more complicated.
  • each terminal device has its own access level, which may be determined through configuration negotiation, or may be written when the terminal device is opened or otherwise stored.
  • access level There are currently four access levels, represented by 0, 1, 2, and 3, with 3 representing the highest access level.
  • the network side monitors the load on the RACH and broadcasts the load control (LoadConctol) value representing the access threshold through the system message.
  • LoadConctol load control
  • the terminal device determines whether the access level of the terminal is greater than the LoadControl value. If yes, it determines that the terminal device is allowed to access, and then performs a persistence test; otherwise, the terminal is determined not to be allowed. Device access.
  • Figure 1 is a flow chart of the existing continuous inspection method.
  • the method includes: In step 101 to step 102, the network side presets a persistent check probability value p corresponding to each access level, and sends the value to the terminal device in the access parameter, and the terminal device according to the The access level obtains a corresponding persistent check probability value p.
  • step 103 to step 104 the terminal device generates a random number X between 0 and 1 for the current continuity check. If X is less than p, it is determined that the terminal device passes the check, and step 105 is performed; otherwise, Go to step 106.
  • step 105 the terminal device transmits a random access probe in the current or next access slot.
  • step 106 to 107 the number of persistent check failures is incremented by one, and it is determined whether the number of persistent check failures has reached a preset maximum number of failures. If yes, step 108 is performed; otherwise, execution is resumed from step 103. After the current continuity check fails, the terminal device continues to perform the next check until the condition that X is less than p is satisfied.
  • the number of times the persistent check is performed is the time that the terminal device needs to wait before sending the access probe.
  • the unit of the number of times is generally It is a time slot or a physical frame or a control segment.
  • step 108 it is determined that the terminal device ends the continuity check and transmits the access probe. It can be seen from the above that the terminal device can access the random access channel by sending a random access probe to the network side only when it is allowed to access and the continuity check is completed.
  • the terminal device since it is impossible to ensure that the access levels of the terminal devices that simultaneously initiate random access are uniformly distributed in the range of 0 to 3, then the terminal device is accepted or rejected according to the LoadControl value and the access level.
  • the system load When accessing, if the access level of most terminal devices is smaller than the LoadControl value, the system load suddenly drops to a lower level after the access of the terminal device is denied.
  • the LoadControl value When the LoadControl value is reduced to less than the access level of the terminal device. After allowing access of these terminal devices, the system load returns to a higher state; if most terminal devices have a large access level and a small LoadControl value, the system load is still not relieved. It can be seen that the load control method of the existing load control method is inferior.
  • the LoadControl value is greater than 1, the terminal device whose access level is smaller than the LoadControl value has no chance to access the network at all, and the fairness is poor.
  • the present invention provides a load control method in random access, which can effectively implement load control in a random access process.
  • the load control method in the present invention presets load control information, and the method includes:
  • the network side detects the system load, determines the load control value corresponding to the detected system load, and sends the load control value to the terminal device;
  • the terminal device determines a corresponding continuity check probability value according to the load control information, the received load control value, and its own access level, and continues using the determined probability value. Sex check, and when passing the continuity check, send the access probe.
  • the load control information includes a correspondence between the homing level and the continuation check probability value of each load control value, and the terminal device determines the continuity check probability value corresponding to the access level of the step B:
  • the terminal device indexes the load control information with its own access level and the received load control value, and obtains a corresponding continuity check probability value.
  • the method further includes:
  • the network side carries the correspondence between the access level and the continuity check probability value under each load control value in a message and sends the message to the terminal device.
  • the terminal device restores the correspondence between the access level and the continuity check probability value under the entire load control value according to the received access parameter message, and saves it.
  • the load control information includes a correspondence between each access level and a continuity check probability value under a load control value, and a unit change multiple m of the continuity check probability value under each access level, and step B
  • the terminal device determines a continuity check probability value corresponding to the access level of the terminal device:
  • the terminal device determines its own access level, determines the difference n between the received load control value and the load control value in the load control information saved by itself, and obtains the total change multiple of the own access level as mn;
  • the probability value corresponding to the access level is read from the saved load control information, and the read probability value is multiplied by the total change multiple mn to obtain the persistent check probability value.
  • the method further includes:
  • the network side sends the correspondence between the access level and the continuity check probability value and the unit change multiple m of the continuity check probability value as load control information to the terminal device, and the terminal device receives the received Load control information is saved.
  • the load control information includes configuration of at least one continuity check probability value
  • the step of sending the load control value to the terminal device the method further includes: the network side transmitting the used configuration mode information to the terminal device;
  • Step B The terminal device determines a continuity check probability value corresponding to the access level of the terminal device.
  • the terminal device determines the configuration content corresponding to the configuration mode information, and reads the received load control value from the configuration content.
  • the probability value corresponding to the level is the probability value corresponding to the level.
  • the method further includes:
  • the network side sends the configuration content corresponding to various configuration modes as load control information to the terminal device, and the terminal device saves the received load control information.
  • the present invention also provides a load control system capable of effectively implementing load control in a random access process.
  • the load control system of the present invention includes: a load control device and a terminal device, wherein the load control device is configured to detect a system load, determine a load control value corresponding to the detected system load, and transmit the load;
  • the terminal device is configured to save load control information, receive information from the load control device, obtain a load control value, and determine a continuity check probability value corresponding to the access level according to the load control value and the load control information, and use the probability value. Perform a continuity check and send a random access probe to the network side when passing the continuity check.
  • the load control device includes: a receiver, a controller, and a transmitter, where the receiver is configured to receive an uplink signal of a random access channel and/or a traffic channel, and send information of the uplink signal to the controller;
  • the controller is configured to receive an uplink signal from the receiver, determine a system load according to the uplink signal, determine a load control value corresponding to the system load, and send the load control value to the transmitter;
  • the transmitter is configured to receive a load control value from the controller and transmit the load control value to the terminal device.
  • the load control device further includes:
  • a data source for receiving a load control value from the controller and forwarding the load control value to the transmitter.
  • the controller is further configured to save the load control information, and send the load control information to the transmitter;
  • the transmitter is further for broadcasting the load control information.
  • the terminal device includes: a communication unit, a storage unit, and a control unit, wherein
  • the communication unit is configured to receive a load control value from the load control device, send the received load control value to the control unit, and communicate with the load control device under the notification of the control unit to send the access probe;
  • the storage unit is configured to store an access level of the terminal device and load control information; the control unit is configured to receive a load control value from the communication unit, and read an access level of the terminal device from the storage unit, according to the received load. Control value, read access level, and load control information in the storage unit, determine a continuity check probability value, and generate a random number, and use the random number and the continuity check probability value for continuity check, in continuity When the check is successful, the communication unit is notified to send a random access probe.
  • the storage unit is further configured to store a maximum number of failures of the pre-set continuity check.
  • the control unit is further configured to obtain a maximum number of failures from the storage unit. After each failure check fails, the number of failures is increased by one and compared with the maximum number of failures. When the maximum number of failures is reached, the continuity check is terminated. Random access probe.
  • the present invention has the following beneficial effects:
  • the terminal device receives the network side broadcast After the LoadControl value and other information, the persistent check probability value used in the random access process is determined according to the access level and the received LoadControl value, and the probability value is used for the continuity check, and the result is determined according to the check result.
  • the delay before sending the random access probe The higher the LoadControl value, the larger the system load, and the smaller the probability value p corresponding to the same access level. In this way, the speed at which the terminal device accesses the network is also slower.
  • the system load is high, the speed of the terminal equipment of each access level is reduced, so that the system load can also be reduced; when the system load is low, the speed of the terminal equipment of each access level is increased.
  • the present invention utilizes the soft capacity characteristics of the communication system to provide the terminal device of each access level with the possibility of allowing access, instead of directly rejecting the access of some terminals whose access level is smaller than the LoadControl value.
  • the fairness between terminal devices is well considered.
  • Figure 1 is a flow chart of an existing continuous inspection method
  • FIG. 3 is a flowchart of a load control method according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of updating a superframe and a LoadControl value according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a load control system according to an embodiment of the present invention. Mode for carrying out the invention
  • the basic idea of the load control method in the embodiment of the present invention is: pre-setting load control information including a continuity check probability value corresponding to each access level in the case of each load control value, and the terminal device according to the current load from the network side
  • the control value and its own access level determine a corresponding probability value, and perform a continuity check on the terminal device according to the determined probability value.
  • the maximum number of failures of the persistent check in the embodiment of the present invention may be a fixed value, or may be an integer related to the persistent check probability value, the LoadControl value, and the access level, for example, l/p, 2/p, l/2p, l/[p*(LoadControl value+1)] and so on.
  • Fig. 2 shows an exemplary flow chart of the load control method of the present invention, which pre-sets load control information.
  • a load control method according to an embodiment of the present invention includes:
  • step 201 the network side detects the system load, determines the LoadControl value corresponding to the detected system load, and sends the LoadControl value to the terminal device;
  • step 202 the terminal device determines a corresponding continuity check probability value according to the load control information, the LoadControl value in the system broadcast, and the access level of the system, and uses the probability value to perform the continuity check, and when passing the continuity check, Send a random access probe to the network side.
  • the terminal device whose access level is lower than the LoadControl value is not directly rejected, but the access is determined according to the result of the continuity check.
  • the network side presets load control information, including the persistence check probability value p corresponding to each access level in the case of four LoadControl values.
  • load control information including the persistence check probability value p corresponding to each access level in the case of four LoadControl values.
  • the specific content is shown in Table 1.
  • LoadControl 0
  • LoadControl l
  • LoadControl 2
  • LoadControl 3
  • Access Level 0 1/16 1/32 1/64 1/128
  • the correspondence between the LoadControl value, the access level, and the continuity check probability value p is visible.
  • the continuity check probability values corresponding to the adjacent access levels are different by 1/2 times, and the access is The higher the level, the larger the corresponding probability value p; when the access level is the same, the adjacent LoadControl values are also 1/2 times different, and the larger the LoadControl value, the smaller the corresponding probability value p.
  • the network side After determining the load control information shown in Table 1 on the network side, the network side periodically transmits the probability value p in the Access Parameter message to the terminal device by means of time division multiplexing.
  • the terminal device obtains each probability value p from the received access parameter message, and saves the corresponding relationship shown in Table 1. In this case, the network side can easily modify the probability value p without additional overhead.
  • Fig. 3 is a flow chart showing the load control method in the case where the probability value p corresponding to the rank of each of the LoadControl values is determined in the above manner.
  • the method includes: In steps 301-303, the network side detects the system load, determines a LoadControl value corresponding to the load by using three predetermined load thresholds, and broadcasts the determined LoadControl value to the terminal device.
  • a network side device such as a Base Transceiver Station (BTS) obtains the load of the channel by detecting the RACH and/or the traffic channel. For The load control value corresponding to the system load is determined.
  • the network side may preset three load thresholds: a first load threshold, a second load threshold, and a third load threshold.
  • the LoadControl value at this time is 0; when the system load is between the first load threshold and the second load threshold, determining the communication system At a higher load, the LoadControl value is 1; when the system load is between the second load threshold and the third load threshold, it is determined that the communication system is under high load, then the LoadControl value is 2; When the value is greater than the third load threshold, it is determined that the communication system is at a very high load, and the LoadControl value at this time is 3. Or, in the opposite way, the higher the system load, the smaller the corresponding LoadControl value. After the LoadControl value is determined, the network side sends the LoadControl value by broadcast, so that the terminal device performs subsequent operations according to the LoadControl value.
  • Fig. 4 shows a schematic diagram of superframe and LoadControl value update in this embodiment.
  • the update can only be performed after the time of the last broadcast of the LoadControl value of 16 superframes.
  • step 304 the terminal device determines a corresponding continuity check probability value p according to the received LoadControl value and its own access level.
  • the mapping between the LoadControl value, the access level, and the continuity check probability value p shown in Table 1 is already present in the terminal device. Therefore, after receiving the LoadControl value broadcasted by the network side, the terminal device in this step The LoadContol value and its own access level are indexed, and the corresponding relationship saved by itself is retrieved, and the corresponding persistence check probability value p is obtained. For example, when the received LoadControl value is 2, and the access level of the terminal device is 1, the continuity check probability value p determined according to the correspondence relationship of Table 1 is 1/16.
  • step 305 the terminal device generates a random number x for the current continuity check.
  • the random number x in this step is an arbitrary value ranging from 0 to 1, and the generation of the value is completely random.
  • steps 306-307 it is determined whether the random number X is less than the persistent check probability value p. If yes, the terminal device sends a random access probe in the current access slot to end the load control process; otherwise, step 308 is performed. .
  • steps 308-310 the number of persistent check failures is incremented by one, and it is determined whether the number of persistent check failures reaches the preset maximum number of failures. If yes, the continuity check is ended, and a random access probe is sent, and the end is ended. The load control flow; otherwise, return to step 305.
  • the above steps 304-310 are a continuous inspection process.
  • the continuity check when the number of persistent check failures corresponding to the terminal device has not reached the maximum number of failures, it indicates that the persistent check can still be continued, that is, there is still a possibility of accessing the network. After the maximum number of failures is reached, the continuity check is no longer performed, and the terminal device can send a random access probe to the network side.
  • the load control information in Table 1 when the maximum number of failures varies according to the access level and/or the LoadControl value, although the probability value p has been set, the access time can be controlled by controlling the maximum number of failures.
  • the access time of each terminal device in the access level can be controlled by continuously checking the probability value p, instead of directly rejecting some terminal devices when the load is high, thereby Uneven distribution of access levels of terminal devices that initiate access When it is even, it can obtain better load control effect, and at the same time ensure the fairness of the terminal equipment in the access process.
  • the network side transmits the continuity check probability value p corresponding to each access level in the case of the load control value to the terminal device in advance, that is, the load control information at this time is included in Table 1.
  • the load control information may be preset to include a correspondence between each access level and a continuity check probability value p under a LoadControl value, and each of the load control values corresponding to each change of the load control value
  • the change factor m of the probability value p of the sex check that is, the unit change multiple m of the probability value p.
  • the load control information is sent by the network side to the terminal device.
  • the probability value p of the continuity check is reduced by a factor of 1/2, that is, multiplied by 1/2 in the p value of the previous stage.
  • the load control information in this embodiment may also include multiple configurations of persistent check probability values.
  • the network side supports four configuration modes, and one bit indicating the configuration mode may be added to the access parameters.
  • the network side and the terminal device both store the specific content of the configuration mode, and the contents of Tables 3 to 6. Then, in the above process, in step 303, the network side broadcasts the LoadControl value, and also uses the configuration mode information to be broadcast, that is, the APersistenceMode is equal to 0, 1, 2 or 3; in step 304, When determining, by the received LoadControl value and the configuration mode information, the terminal device determines the continuity check probability value p corresponding to the access level, first determines the specific configuration content corresponding to the configuration mode information, and then reads from the configuration content to the LoadControl. The probability value p corresponding to its own access level.
  • the present invention also provides a load control system that performs the above load control method.
  • Fig. 5 is a view showing an exemplary configuration of a load control system in the present invention.
  • the load control system includes: a load control device and a terminal device.
  • the load control device is configured to save the preset load control information, detect the system load, determine the LoadControl value corresponding to the detected system load, and perform broadcast;
  • the terminal device is configured to save the preset load control information, and receive the load from the load. Control the broadcast of the device, obtain the LoadControl value, and determine according to the LoadControl value, its own access level, and load control information.
  • the continuity check probability value corresponding to the own access level is used to perform the continuity check, and when the continuity check is passed, the random access probe is sent.
  • the load control device is located on the network side, and the device includes a receiving portion and a transmitting portion.
  • the receiving portion includes a receiver and a controller; and the transmitting portion includes a data source and a transmitter.
  • the receiver is configured to receive an uplink signal of the RACH channel and/or the traffic channel, send the information of the uplink signal to the controller, and receive the random access probe from the terminal device;
  • the storage unit in the controller is used to save the load control The information, the load threshold, and the correspondence between the respective intervals formed by the load threshold and the LoadControl value; after receiving the uplink signal from the receiver, the load detecting unit in the controller determines the system load according to the uplink signal, and determines the system load from the controller.
  • the storage unit reads the load threshold and the corresponding relationship between the load threshold and the LoadControl value, determines the LoadControl value corresponding to the system load, and sends the LoadControl value to the data source in the receiving part.
  • the data source is configured to receive a LoadControl value from the controller and forward the LoadControl value to the transmitter; the transmitter is configured to receive a LoadControl value from the data source and broadcast the LoadControl value to the terminal device.
  • the terminal device includes: a communication unit, a storage unit, and a control unit.
  • the communication unit is configured to receive a LoadControl value of the transmitter from the load control device, and send the received LoadControl value to the control unit, and send a random connection to the receiver in the load control device under the notification of the control unit.
  • a storage unit is configured to store an access level of the terminal device and load control information; the control unit is configured to receive a LoadControl value from the communication unit, and read an access level of the terminal device from the storage unit, according to the receiving The LoadControl value, the read access level, and the load control information in the storage unit, determine the persistence check probability value p, and generate a random number X, and use the random number X and the persistent check probability value p for continuity check. When the continuity check is successful, notify the communication unit to access the network.
  • the storage unit may also store a preset maximum number of failures, and the control unit obtains the maximum number of failures from the storage unit, and after each failure check fails, the number of failures is increased. After 1 is compared with the maximum number of failures, the terminal device can send an access probe when the maximum number of failures is reached.
  • the storage unit in the load control device stores the correspondence between each access level and the continuity check probability value p under each LoadControl value; the load detection unit is used for the slave storage unit.
  • the foregoing correspondence is obtained, and is broadcasted by the data source and the transmitter.
  • the communication unit in the terminal device transmits the information to the storage unit in the terminal device through the control unit, and the storage unit saves.
  • the load control device When the load control information includes a correspondence between a preset Load Control value and a persistent check probability value p and a unit change multiple m of the persistent check probability value p for each access level, the load control device
  • the storage unit of the controller stores the correspondence between each access level and the continuity check probability value p under the preset LoadControl value, and saves the unit change multiple m of the continuity check probability value p under each access level;
  • the detecting unit obtains the unit change multiple m of the correspondence relationship and the continuity check probability value p from the storage unit, and then broadcasts to the terminal device through the data source and the transmitter; the communication unit in the terminal device receives the correspondence relationship and the continuity check probability
  • the unit change multiple m of the value p is forwarded to the storage unit in the terminal device by the control unit, and the storage unit stores the received information.
  • the storage unit of the controller in the load control device stores the configuration mode information of the preset persistent check probability value p, and the load detection After obtaining all configuration modes from the storage unit, the unit broadcasts to the terminal device through the data source and the transmitter; the communication unit in the terminal device receives the configuration mode information from the load control device, and forwards the information to the terminal device through the control unit.
  • the load control device broadcasts the LoadControl value and broadcasts the configuration mode used together;
  • the communication unit in the terminal device receives the configuration mode, and
  • the control unit sends to the control unit, and the control unit determines the continuity check probability p according to the access level, the configuration mode information in the storage unit, and the configuration manner from the communication unit.
  • the load control device can be a BTS, and the terminal device can be a mobile phone or the like.
  • the terminal device receives the information such as the LoadControl value broadcasted by the network side, and then according to its own access level. And the received LoadControl value, determining the persistence check probability value p used in the random access process, using the probability value p for continuity check, and determining the delay before sending the random access probe according to the check result.
  • the embodiment of the present invention utilizes the soft capacity feature of the communication system to provide the terminal device of each access level with the possibility of allowing access, instead of directly rejecting the access of the terminal whose access level is smaller than the LoadControl value.
  • the fairness between terminal devices is well considered.

Abstract

L'invention porte sur un procédé de régulation de charge par une procédure à accès aléatoire selon laquelle on prédéfini une information de régulation de charge, et qui comporte les étapes suivantes: A. Détection de la charge du système côté réseau, détermination de la valeur de régulation correspondante de la charge de système détectée, et transmission de l'information à un dispositif terminal, et B. Détermination par le dispositif terminal de la probabilité de test de persistance liée à son propre niveau d'accès, en fonction de l'information de régulation de charge et de la valeur de régulation de charge reçue, puis exécution du test de persistance en utilisant la probabilité déterminée, et transmission de la sonde d'accès après le test de persistance.
PCT/CN2007/070343 2006-07-26 2007-07-23 Procédé de régulation de charge et système correspondant d'une procédure à accès aléatoire WO2008014708A1 (fr)

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