WO2015085495A1 - Procédé et dispositif de réglage de paramètre d'accès aléatoire - Google Patents

Procédé et dispositif de réglage de paramètre d'accès aléatoire Download PDF

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Publication number
WO2015085495A1
WO2015085495A1 PCT/CN2013/089014 CN2013089014W WO2015085495A1 WO 2015085495 A1 WO2015085495 A1 WO 2015085495A1 CN 2013089014 W CN2013089014 W CN 2013089014W WO 2015085495 A1 WO2015085495 A1 WO 2015085495A1
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WIPO (PCT)
Prior art keywords
random access
base station
user equipment
threshold
adjusted
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PCT/CN2013/089014
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English (en)
Chinese (zh)
Inventor
王学亮
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201380002438.7A priority Critical patent/CN103814620B/zh
Priority to PCT/CN2013/089014 priority patent/WO2015085495A1/fr
Publication of WO2015085495A1 publication Critical patent/WO2015085495A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition

Definitions

  • the embodiments of the present invention relate to the field of communications technologies, and in particular, to a method and a device for adjusting random access parameters. Background technique
  • the user equipment (UE, user equipment) needs to initiate a random access procedure before performing data transmission with the base station.
  • the user equipment first selects an access slot, and sends a random access preamble to the base station through the random access channel. If the user equipment does not receive the acknowledgment message from the base station, the user equipment starts the pre-crawling process to improve the transmit power of the random access preamble.
  • the random access preamble is sent again, until the user equipment receives the acknowledgement message from the base station, indicating that the random access preamble is successfully sent, and the user equipment may then send the random access information to the base station to complete the random access procedure.
  • the user equipment needs to use random access parameters to randomly transmit the preamble.
  • the random access parameters can directly affect the quality of the random access procedure. If the actual access conditions of the network are not considered, only the pre-configured random access parameters are used to send the random access preamble, which will result in the random access success rate being too low.
  • the base station device adjusts the random access parameters according to the number of random access attempts reported by the user equipment.
  • random access parameter adjustment when random access parameter adjustment is performed, there are multiple random access attempts, and the current random access channel has been congested, and the success rate of random access has been reduced. Summary of the invention
  • the embodiment of the invention provides a method and a device for adjusting random access parameters, which can Prevent congestion on the random access channel and avoid the random access success rate.
  • an embodiment of the present invention provides a method for adjusting a random access parameter, where the method includes
  • the base station device After receiving the random access preamble, the base station device sends an acknowledgement message to the at least one user equipment, where the acknowledgement message indicates that the base station device successfully receives the random access preamble;
  • the base station device compares the number of the acknowledgement messages with a first threshold, where the first threshold is used to indicate a channel congestion state;
  • the base station device adjusts the random access parameter to obtain the adjusted random access parameter
  • the method further includes: the base station device monitoring an uplink total bandwidth power (RTWP) of the cell, and the uplink RTWP and the preset The RTWP threshold is compared.
  • the determining, by the base station device, the random access parameter specifically includes:
  • the uplink RTWP is higher than the preset threshold of the RTWP, and the number of the acknowledgment messages is greater than or equal to the first threshold, and the base station device adjusts the random access parameter.
  • the method further includes: receiving, by the base station device, a random access preamble sent by the at least one user equipment according to the adjusted random access parameter;
  • the base station device After receiving the random access preamble sent by the at least one user equipment according to the adjusted random access parameter, the base station device sends a new acknowledgement message to the at least one user equipment, where the new acknowledgement message indicates that the The base station device successfully receives the random access preamble sent by the at least one user equipment according to the adjusted random access parameter; the number of times the base station device records the new acknowledgement message;
  • the second threshold is used to determine the number of random access preambles sent by the at least one user equipment according to the adjusted random access parameter. Whether it is in the normal range;
  • the number of times the new acknowledgment message is less than or equal to the second threshold and the base station device sends the random access parameter to the at least one user equipment.
  • the number of the new acknowledgment message is less than or equal to the second threshold, and the base station device sends the at least one The user equipment sends the random access parameter to include,
  • the base station device sends the adjusted random access parameter to the at least one user equipment for a preset time, and after the preset timeout expires, the random connection is sent to the at least one user equipment. Enter the parameters.
  • the base station device receives the at least one user equipment according to the random
  • the random access preamble sent by the access parameter includes, Receiving, by the base station device, the at least one user equipment through a random access channel
  • RACH or enhanced random access channel The random access preamble sent by the E-RACH.
  • the base station device records the base station device to the base station The sum of the number of times the acknowledgment message is sent by all user equipments in the cell of the device.
  • the embodiment of the present invention provides a base station device, configured to adjust a random access parameter, where the base station device includes:
  • a receiving unit configured to receive a random access preamble sent by at least one user equipment according to a random access parameter
  • a first sending unit configured to send, after the receiving unit receives the random access preamble, an acknowledgement message to the at least one user equipment, where the acknowledgement message indicates that the base station device successfully receives the random access Leading
  • a recording unit configured to record a number of times that the first sending unit sends an acknowledgement message to the at least one user equipment
  • a first comparison unit configured to compare the number of times of the acknowledgement message with a first threshold, where the first threshold is used to indicate a channel congestion state
  • the adjusting unit is configured to: when the number of times the acknowledgment message is greater than or equal to the first threshold, adjust the random access parameter to obtain the adjusted random access parameter;
  • a second sending unit configured to send the adjusted random access parameter to the at least one user equipment.
  • the base station device further includes a monitoring unit, configured to monitor an uplink receiving total bandwidth power RTWP of the cell, and send the monitored RTWP to the second comparing unit;
  • a second comparing unit configured to receive the uplink RTWP from the monitoring unit, and compare with a preset RTWP threshold, and send a second indication when the uplink RTWP is higher than the RTWP preset threshold A message is sent to the adjustment unit.
  • the adjusting unit is further configured to: when the uplink RTWP is higher than the RTWP preset threshold and the number of the acknowledgment messages is greater than or equal to the first threshold, adjust the random access parameter.
  • the receiving unit is further configured to: receive a random access preamble sent by the at least one user equipment according to the adjusted random access parameter;
  • the first sending unit is further configured to: after the receiving unit receives the random access preamble sent by the at least one user equipment according to the adjusted random access parameter, to the at least one user equipment Sending a new acknowledgment message, the new acknowledgment message indicating that the base station device successfully receives the random access preamble sent by the at least one user equipment according to the adjusted random access parameter;
  • the recording unit is further configured to record the number of times of the new confirmation message
  • the first comparing unit is further configured to compare the number of the new acknowledgment message with a second threshold, where the second threshold is used to determine that the at least one user equipment sends according to the adjusted random access parameter. Whether the number of random access preambles is within the normal range;
  • the sending unit is further configured to: when the number of the new confirmation message is less than or equal to Sending, by the second threshold, the random access parameter to the at least one user equipment.
  • the second sending unit is further configured to send the random access parameter to the at least one user equipment.
  • the second sending unit is further configured to: maintain the sending to the at least one user equipment within a preset time After the preset timeout expires, the random access parameter is sent to the at least one user equipment.
  • the receiving unit is further configured to receive the at least one The random access preamble sent by the user equipment through the random access channel RACH or the enhanced random access channel E-RACH.
  • the recording unit is further configured to: record the base station device The sum of the number of times the acknowledgment message is sent to all user equipments in the cell of the base station device.
  • an implementation of the present invention provides a user equipment, including
  • a sending unit configured to send a random access preamble to the base station device according to the random access parameter
  • the receiving unit is configured to receive a random access preamble acknowledgement message sent by the base station device, where the acknowledgement message indicates that the base station device successfully receives
  • the random access preamble is configured to receive the adjusted random access parameter sent by the base station device, where the adjusted random access parameter is recorded by the base station device at the base station device
  • An acknowledgement message of a random access preamble sent by at least one user equipment in a cell of the base station device After the number of times is greater than or equal to the first threshold, the random access parameter is adjusted and sent to the at least one user equipment, where the first threshold is used to indicate a channel congestion state; and the sending unit is further configured to use The adjusted random access parameter sends a new random access preamble to the base station device.
  • the adjusted random access parameter sent by the base station device is that the number of acknowledgment messages of the random access preamble by the base station device is greater than or equal to And a threshold, and when the uplink received total bandwidth power RTWP monitored by the base station device is higher than the preset threshold of the RTWP, the random access parameter is adjusted and sent to the at least one user equipment.
  • the sending unit is configured to send a random access preamble to the base station device according to the random access parameter, Includes:
  • the transmitting unit sends the random access preamble through a random access channel RACH or an enhanced random access channel E-RACH.
  • the method and the device disclosed in the embodiment of the present invention are used to count the number of acknowledgment messages of the random access preamble sent by the user equipment in the cell, and compare with the preset threshold value to determine whether the random access channel in the current cell is There is a risk of congestion, and if there is a risk of channel congestion, the random access parameters are automatically adjusted. It is ensured that before the random access channel is congested, the user equipment can use the optimized random access parameter to send the random access preamble, which can prevent channel congestion, and the user equipment does not need to repeatedly perform random access attempts due to channel congestion, and maintains Relatively constant random access success rate.
  • FIG. 1 is a schematic diagram of an application scenario according to an embodiment of the present invention.
  • FIG. 2 is a flowchart of a method for adjusting a random access according to an embodiment of the present invention
  • FIG. 3 is a flowchart of another method for adjusting a random access according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a base station device according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic diagram of a user equipment according to an embodiment of the present invention. detailed description
  • GSM Global System for Mobile Communications
  • CDMA Code Division Multiple Access
  • TDM A time division multiple access
  • WCDMA wideband code division multiple access
  • LTE long term evolution
  • LTE long term evolution
  • the communication system of the embodiment of the present invention may include a base station device and a user equipment. Its The base station device can be configured to communicate with the user equipment.
  • FIG. 1 is a schematic diagram of a working scenario of a base station device.
  • the base station device includes a base station controller, and the base station controller can manage at least one base station, such as the base station 1, the base station 2, and the base station 3 shown in FIG. 1, between each base station and the base station controller.
  • Each base station can manage at least one cell, such as base station 1 - base station 3, which manages one cell, namely, cell 1, cell 2, and cell 3.
  • the cell 1 includes a user equipment 1, a user equipment 2, and a user equipment 3. When a certain user equipment wants to move from an idle state to a connected state, or is in a cell forward access state, a cell paging state, or a registered area paging state.
  • the connection may be established with the base station 1 through the random access procedure to obtain the corresponding communication service.
  • the random access procedure of each user equipment and the base station 1 is performed independently, and the base station can simultaneously process random access requests sent by multiple user equipments.
  • a certain user equipment moves to another cell, it can re-establish connection with other base stations to ensure the quality of service.
  • the base station device may comprise different components, for example, in a GSM, CDMA or WCDMA system, the base station device may comprise a base station and a base station controller, and the base station may be finger-joined
  • a device in the network that communicates with the user equipment over one or more sectors on an air interface may be a base transceiver station (BTS) of a GSM, or CDMA system, or may also be a WCDMA system.
  • BTS base transceiver station
  • Node B Node B
  • the base station controller may be a base station controller (BSC) in a GSM, or CDMA system, or a radio network controller (RNC) in a WCDMA system.
  • BSC base station controller
  • RNC radio network controller
  • the base station and the base station controller may be connected by wire or wirelessly
  • the base station is under the control of the base station controller.
  • the user equipment may be a user equipment that performs data transmission with a base station in a wireless manner, such as a mobile phone, a personal computer having a wireless communication function, and the like.
  • the base station device may include an evolved node: 6 (e-Node B, evolved Node B), and the e-Node B may have some functions controlled by the base station, including, for example, Scheduling transmission of paging information; scheduling transmission of broadcast information; and setting and providing measurement of e-Node B, and the like.
  • the user equipment in the cell initiates more random access requests to the base station equipment in a unit time, and the data transmission capacity of the cell random access channel is limited.
  • the channel congestion is prone to occur, and the random access preamble transmission is unsuccessful.
  • the random access attempt by the user equipment is repeated, resulting in a decrease in the random access success rate and further deterioration of the channel signal energy.
  • the base station device acquires the load condition on the random access channel of the area according to the number of times of the acknowledgment message of the random access preamble sent by the user equipment in the cell, and then uses the information on the user equipment.
  • the random access parameters are reasonably adjusted.
  • the user equipment may send a random access preamble to the Node B.
  • the Node B After receiving the ACK, the Node B sends an acknowledgment message to the user equipment, indicating that the random access preamble is successfully sent, and the number of times the Node B records the acknowledgment message. And reporting to the RNC according to the period, the RNC processes the number of the acknowledgment messages and compares with the preset threshold, and exceeds the preset threshold to adjust the random access parameters.
  • the LTE system is used as an example.
  • the user equipment can send a random access preamble to the e-Node B.
  • the e-Node B After receiving the e-Node B, the e-Node B sends an acknowledgment message to the user equipment, indicating that the random access preamble is successfully sent, and the e-Node B records. The number of times the message is confirmed and compared with a preset threshold If the preset threshold is exceeded, the random access parameters are adjusted.
  • the user equipment may send the random access preamble to the base station device by using the adjusted random access parameter.
  • the main random access parameters include the initial power constant of the random access preamble, the power ramp step of the random access preamble (PowerRampStep), and the maximum number of climbs of the random access preamble (PreambleRetransMax).
  • the user equipment sends a random access preamble with an initial transmit power, where the initial transmit power is proportional to the initial power constant; if the initial transmit power is not detected by the network device, the preamble transmission fails, and the network device does not send the user
  • the device sends an acknowledgement indication, and the user equipment needs to start the corresponding lead climbing cycle period, increase the power by a certain power, and then send the signal again after a period of time until the power is greater than or equal to the value that the base station device can detect and is confirmed. Sent successfully. If the number of times the user equipment retransmits the preamble exceeds the maximum number of climbs and the base station equipment has not been acknowledged, the transmission fails.
  • the adjusting the random access parameter in the embodiment of the present invention refers to adjusting the value of the random random access parameter, that is, adjusting according to the initial value of the random access parameter, and obtaining the adjusted random access parameter, the random access parameter.
  • the initial value can be pre-configured in the base station device.
  • An embodiment of the present invention provides a method for adjusting random access parameters. Referring to FIG. 2, the method includes:
  • the base station device receives a random access preamble sent by the user equipment according to the random access parameter.
  • the user equipment may be any one or any of a plurality of user equipments of the base station equipment. When the user equipment needs to perform uplink data transmission, it can access the random access channel.
  • RACH random access channel
  • the user equipment may also use the E-RACH to send a random access preamble to the base station.
  • E-RACH enhanced-random access channel
  • the base station device After receiving the random access preamble, the base station device sends an acknowledgement message to the user equipment, where the acknowledgement message indicates that the base station device successfully receives the random access preamble.
  • the base station device may record the number of acknowledgment messages sent to the user equipment, and the number of acknowledgment messages may reflect the load condition on the RACH. If the load is too high, the risk of channel congestion may occur; if the random access request keeps increasing RACH will be congested, affecting the success rate of random access.
  • the user equipment may be referred to as an E-RACH user.
  • the base station device can record the number of acknowledgment messages for the random access preamble transmitted on the E-RACH.
  • the transmission of the acknowledgment number of the random access preamble of the E-RACH is considered.
  • Optimizing the random access parameters of the E-RACH user can also effectively reduce the E-RACH load and improve the success of the E-RACH user random access. Therefore, the channel congestion described in the embodiment of the present invention may include congestion of the RACH; or congestion of the E-RACH; or congestion of both the RACH and the E-RACH.
  • the base station device can record the delivery to the user equipment in the period according to a preset period. The number of times the message is acknowledged, and the number of acknowledgment messages in multiple preset periods is recorded. The base station device may further perform filtering processing on the number of the acknowledgment messages recorded in the multiple preset periods to obtain the number of times of the processed acknowledgment message, and the number of the processed acknowledgment messages may be used as the acknowledgment message. The number of times used.
  • the filtering process refers to filtering out the number of times of the plurality of confirmation messages that are too high and too low. The filtering process is performed to prevent an abnormal peak from occurring in the actual number of acknowledgment messages within a specific time, resulting in an unnecessarily triggering adjustment process of the random access parameters.
  • the length of the preset period may be set according to system requirements and actual network operation conditions. For example, if the system can carry a large load, the preset period may be set to a time length greater than a time when the system carries a smaller load. Length; If there are more users in the network during actual network operation, the length of the preset period can be set shorter. If there are fewer users in the network, the length of the preset period can be set longer.
  • the base station device may also perform a comprehensive condition to set the length of time of the preset period. For example, the choice is 1 second to ensure the accuracy of the channel congestion decision. In the embodiment of the present invention, the length of the preset period is not limited.
  • the filtering process can be performed in two ways.
  • the first method is to record the number of times of the confirmation message by the base station, and report the number of times of the confirmed acknowledgement message.
  • the base station controller performs filtering processing on the number of times of the acknowledgement message. For example, in a WCDMA system, the number of times the Node B periodically reports the acknowledgment message, and the RNC calculates the average of the number of N (N > 1 , N is an integer) acknowledgment messages reported by the Node B.
  • Node B A longer reporting period can be used, for example 10s ⁇ 30s. For example, if the reporting period is 10s and N is 5, the Node B reports the number of times the acknowledgment message is obtained to the RNC once every 10 seconds, and the RNC can record the number of 5 acknowledgment messages reported, and then 5 The average of the number of times the acknowledgment message is used as the number of acknowledgment messages after processing.
  • the second method is to record and filter the number of times the acknowledgment message is completed by the base station, and then report the number of times of the acknowledgment message to the base station controller.
  • the number of times the acknowledgment message is recorded by the Node B in a preset period, and then the averaging process is performed on the number of acknowledgment messages recorded in the M preset periods, where ⁇ > 1 , M is an integer. For example, if the preset period is 10s and M is 5, the Node B will average the number of times of the 10th, 20s, 30s, 40s, and 50s confirmation messages recorded, and the processed confirmation message will be processed. The number of times is reported to the RNC.
  • the above two statistical methods are also applicable to 2G/3G communication systems such as GSM and CDMA.
  • the above-mentioned recording and processing of the number of acknowledgement messages can be completed by the e-Node B.
  • the base station device compares the number of the acknowledgment messages with a first threshold, where the first threshold is used to indicate a channel congestion status.
  • the first threshold has a mapping relationship with a channel congestion state.
  • the channel congestion state may be represented by various parameters, for example, by a congestion coefficient, assuming that the channel is fully congested to 100%, and A is a congestion coefficient (the value of A is between 0 and 1), corresponding to A. * 100% congestion status, can be reacted with different first thresholds.
  • A can be set to reflect the value of the channel congestion state at the critical point, and the corresponding first threshold can be processed according to RACH or E-RACH. Therefore, corresponding to different channel congestion states, the first threshold may take different values. For example, as shown in Table 1, it is assumed that the number of acknowledgment messages corresponding to the channel full congestion is 30 times per second.
  • the correspondence between the value of the first threshold and the congestion coefficient is only an example. In an actual application, different values of the first threshold and different congestion coefficients may be set.
  • the mapping relationship between the first threshold and the parameter indicating the congestion state of the channel may be set. The embodiment of the present invention is not limited herein.
  • the first threshold may also be determined according to the user equipment random access request in the same 'region to reach the full load of the cell, where the full load indicates the upper limit of the base station device processing the random access request, and the channel may be embodied. Congestion status.
  • the first threshold may be dynamically adjusted by the base station device according to the actual situation of the network, or may be set in advance with reference to the empirical value, which is not limited in this embodiment.
  • the number of the acknowledgment messages is greater than or equal to the first threshold, the number of random access preambles to be processed in the current cell is large, and the channel congestion risk exists in consideration of the capacity of the channel capacity.
  • the channel pressure can be alleviated by reducing the frequency and number of random access preamble transmissions, and the random access preamble transmission failure due to channel congestion is avoided.
  • the base station device can successfully receive the random access preamble, and is not affected by channel congestion. .
  • the base station device adjusts the random access parameter, obtains the adjusted random access parameter, and sends the adjusted random access parameter to the The user equipment.
  • the excessive transmission of the random access preamble of the user equipment may have a negative impact on the channel transmission quality of the cell, and may be changed by adjusting the random access parameters. Into the strategy to improve communication.
  • the base station device does not need to adjust the random access parameters.
  • the random access parameters that can be adjusted include: an initial power constant of the random access preamble, a power climbing step of the random access preamble, and any two or three of the maximum number of times of the random access preamble.
  • the adjusting the random access parameter may be: reducing the initial power constant and increasing the power climbing step; or decreasing the initial power constant and increasing the maximum number of climbs; or reducing the Determining the power step and increasing the maximum number of climbs; or lowering the initial power constant, increasing the power step and increasing the The maximum number of climbs.
  • the transmit power of the first random access preamble in the random access process can be reduced, thereby reducing the uplink power.
  • the adjustment may reach the random access preamble. The maximum transmit power has no effect.
  • the base station device sends the adjusted random access parameter to the user equipment in the cell, and the user equipment may send the random access preamble to the base station device by using the adjusted random access parameter in the random access request initiated later.
  • the base station device may send the user equipment in the cell by means of cell broadcast.
  • the RNC may send the adjusted random access parameter to the Node B by means of a system message, for example, through a system information block (SIB5) including a common physical channel configuration parameter of the cell, and then The Node B is broadcast to the user equipment.
  • SIB5 system information block
  • an initial value of the random access parameter may be preset in the base station device.
  • the initial value can be set according to the actual value of the network according to the value range specified by the protocol.
  • the initial range of initial power constants specified in the 3GPP protocol may be -35 db ⁇ -10 db, and the initial range of the initial value of the power ramping step is ldb ⁇ 8 db, and the initial value of the maximum number of climbs is optional.
  • the range is from 1 to 64 times.
  • the base station device adjusts the random access parameter according to the recorded number of times of the acknowledgment message of the random access preamble sent by the user equipment in the cell,
  • the number of times the acknowledgment message is recorded by the base station device indicates that the user equipment can still access the network in the current cell, and the channel condition of the network has not deteriorated. Therefore, according to the number of acknowledgment messages of the random access preamble, the number of acknowledgment messages of the random access preamble can be determined in advance.
  • the user equipment sends a risk of congestion on the channel used for the random access preamble. If the risk of channel congestion occurs in the current cell, the random access parameter is adjusted. It is ensured that before the random access channel is congested, the user equipment can use the optimized random access parameter to send a random access preamble, which can prevent channel congestion and maintain the random access success rate.
  • the method in the embodiment of the present invention is also applicable to a situation in which a channel has been congested, which affects a random access preamble transmission.
  • the random access preamble transmission excessively increases channel congestion, and the random access parameter is adjusted.
  • the pressure of the random access process on the data capacity of the random access channel can be reduced, thereby reducing or even eliminating channel congestion.
  • steps 106-1013 may be further included:
  • the base station device continues to receive the random access preamble sent by the user equipment in the cell, and the adjusted random access parameter is used in the sending process of the random access preamble.
  • the base station device continues to send a new acknowledgement message to the user equipment.
  • the number of times of the new confirmation message obtained by the recording is the same as the number of times of the confirmation message recorded in step 104, and the filtering process may be performed, and the processed new confirmation message may be The number of new confirmation messages obtained as records will not be described here.
  • step 1010 Compare the number of the new acknowledgment message with the first threshold, if the number of the new acknowledgment message is still greater than or equal to the first threshold, go to step 1010; if the number of new acknowledgment messages is less than the first threshold, turn Proceed to step 1011.
  • the previous adjustment result can be sent to the user equipment in this adjustment process. It is also possible to continue to adjust the random access parameters to more effectively alleviate the channel congestion state.
  • 1011 Compare the number of the new acknowledgement message with a second threshold, where the second threshold is smaller than the first threshold.
  • the second threshold is used to determine whether the number of random access preambles sent by the user equipment is within a normal range.
  • the second threshold may be used to measure whether the channel congestion state has been cancelled due to the decrease of the random access preamble transmission or the base station processes the random access request normally, and no channel congestion occurs. If the number of the new acknowledgement message is less than The second threshold indicates that the channel is not congested before the current judgment or the random access preamble is transmitted by the user equipment using the adjusted random access parameter, and channel congestion has been eliminated.
  • the step of transferring If the number of the new confirmation message is less than or equal to the second threshold, the step of transferring
  • step 1013 If the number of the new confirmation message is greater than the second threshold, go to step 1013.
  • the base station device resumes sending an initial value of the random access parameter to the user equipment. If the number of the new acknowledgment message is less than or equal to the second threshold, the base station device does not need to continue to adjust the random access parameter, but may restore the initial value of the random access parameter to the user equipment, and the user equipment utilizes The initial value of the access parameter initiates random access, which can obtain a shorter access delay and save network resources.
  • the value of the second threshold is smaller than the first threshold, and the second threshold may be selected according to the actual operation of the network.
  • the base station device can immediately restore the initial value of the random access parameter to the user equipment, or maintain the adjusted random access parameter to the user equipment within a preset time, the preset After the timeout expires, the initial value of the random access parameter is resumed.
  • the channel congestion warning has been cancelled.
  • the state of the adjustment parameter is maintained and stopped after a certain period of time, in order to prevent the parameter adjustment process from being executed immediately after a short period of time. Stop again, if this situation occurs frequently, it will cause waste of network resources.
  • the random access parameters are continuously adjusted within a preset period of time, and the adjusted random access parameters are sent to the user equipment during the period. If the preset time is exceeded, the adjustment process is ended, and the initial value of the random access parameter is restored.
  • the base station device maintains a previous adjustment result before the current random access parameter adjustment procedure is sent to the user equipment or restores an initial value of the random access parameter.
  • the user equipment can send a random access preamble through the preset initial value of the random access parameter, shorten the access delay, and adjust the program to improve the efficiency.
  • the base station device may record to the base station The sum of the number of times the acknowledgment message is sent by all user equipments in the cell of the device.
  • the base station device can simultaneously process the random access request sent by different user equipments in the cell. Therefore, the acknowledgment message of the random access preamble can be sent to multiple user equipments at the same time.
  • the base station device compares the total number of times the acknowledgment message is recorded with the preset first threshold and the second threshold, learns the channel load condition, determines the channel congestion status, and then adjusts the random access parameter.
  • An embodiment of the present invention further provides a method for adjusting random access parameters, as shown in FIG. 3.
  • the base station device can monitor the uplink total received bandwidth (RTWP) of the cell, and the base station device can periodically monitor, or can monitor the RTWP based on event triggering.
  • RWP uplink total received bandwidth
  • the uplink power load is increased, which affects the uplink data capacity and the uplink throughput rate. Since the random access process affects the uplink power load of the cell, the channel congestion decision may be used according to the current power load condition of the current cell to determine whether the random access parameter adjustment needs to be performed, if the uplink power load of the current cell is too high and channel congestion occurs.
  • the pre-configured random access parameters are used by the user equipment to adjust the random access parameters to reduce the uplink power load. If the uplink power load of the current cell is at a lower level, the random access parameters need not be adjusted.
  • the initial value initiates randomization to the base station Access to get a shorter access delay.
  • the uplink power load of the current cell can be known by monitoring the uplink RTWP of the cell.
  • the uplink RTWP reflects the degree of network uplink interference and can be used to evaluate the network uplink load.
  • the monitoring period of the uplink RTWP may be selected as Is to improve the power admission control effect of the base station equipment.
  • the monitored uplink RTWP is stored inside the base station device and can be updated according to the monitoring period.
  • the detection period in the embodiment of the present invention is not particularly limited.
  • the monitoring of the uplink RTWP may be performed at any time before the channel congestion warning is initiated, and the base station device may acquire the current cell as long as the uplink RTWP needs to be used as the determining condition for adjusting the random access parameter.
  • the uplink RTWP is not particularly limited.
  • the steps 201-203 may refer to steps 101-103 in the embodiment of FIG. 1, and details are not described herein.
  • the base station device compares the number of the acknowledgment messages with a first threshold. If the number of the acknowledgment messages is greater than or equal to the first threshold, the process proceeds to steps 205-207. If no, the process returns to step 201. If yes, go to step 206; if no, go back to step 201.
  • the preset threshold of the uplink RTWP may be determined by the base station device according to network statistics. According to the automatic determination, or according to actual needs, the empirical value or experimental value can be arbitrarily selected.
  • the uplink power load full load of the cell is counted as 100%, and the uplink power load ratio of the preemptive congestion and the adaptive random access parameter optimization algorithm is A% (A>50%), and the corresponding correspondence is calculated.
  • the value of the RTWP is the preset threshold.
  • the base station device adjusts random access parameters.
  • step 105 for the method for adjusting the random access parameters, reference may be made to step 105 in the embodiment shown in FIG. 1, which is not described herein.
  • the base station device sends the adjusted random access parameter to the user equipment, and the user equipment may send the random access preamble to the base station device by using the adjusted random access parameter.
  • the method may further include steps 208-2015, where the steps 208-2015 may refer to 106-1013 in the embodiment shown in FIG. 1, and details are not described herein.
  • the base station device monitors the uplink power load of the cell, and periodically counts the delivery status of the acknowledgment message of the random access preamble, and adjusts the randomness according to the channel congestion situation and the uplink power load value of the cell.
  • the access parameter is sent to the user equipment and used to send the random access preamble.
  • the uplink power load of the cell is reduced under the premise of ensuring the success rate of the random access; and when the uplink power load of the cell is low, the random access parameters are not adjusted, and the short access can be obtained. Access delay.
  • the embodiment of the invention further provides a base station device, which is used for adjusting random access parameters. As shown in FIG. 4, the base station device includes:
  • the receiving unit 301 is configured to receive a random access preamble sent by the at least one user equipment according to the random access parameter.
  • the receiving unit 301 is configured to receive a random access preamble sent by the at least one user equipment by using RACH or E-RACH.
  • the function of the receiving unit 301 can also be performed by a receiver.
  • the first sending unit 302 may be configured to send, after the receiving unit receives the random access preamble, an acknowledgement message to the at least one user equipment, where the acknowledgement message indicates that the base station device successfully receives the random Access the preamble.
  • the function of the first transmitting unit 302 can also be performed by a transmitter.
  • the recording unit 303 can be configured to record the number of times the first sending unit sends the confirmation message to the at least one user equipment.
  • the statistic unit 303 may include: a first recording sub-unit 3031, configured to record the number of acknowledgment messages actually sent to the user equipment; and a second recording sub-unit 3032, configured to confirm the actual recorded message. The number of times is filtered, and the number of times of the processed confirmation message is obtained as a basis for judging the channel congestion warning.
  • the first comparison unit 304 is configured to compare the number of the acknowledgment messages with a first threshold, where the first threshold is used to indicate a channel congestion status.
  • the first comparison unit 304 obtains the number of times the processed confirmation message is obtained from the recording unit 303, and after comparing, sends the comparison result in the form of an indication message.
  • the sending to the adjusting unit 305 includes: when the number of the confirmation messages is greater than or equal to the first threshold, sending an indication message to the adjusting unit 305.
  • the adjusting unit 305 is configured to receive the indication message, adjust a random access parameter, and obtain an adjusted random access parameter.
  • the second sending unit 306 is configured to send the adjusted random access parameter to the at least one user equipment.
  • it can be sent to each user equipment in the cell by means of a cell broadcast.
  • a cell broadcast For details, refer to the related description in the method embodiment shown in FIG.
  • the number of the acknowledgment messages is greater than or equal to the first threshold, the number of random access preambles to be processed in the current cell is large, and the channel congestion risk exists in consideration of the capacity tolerance of the channel capacity.
  • the channel pressure can be alleviated by reducing the frequency and number of random access preamble transmissions, and the random access preamble transmission failure due to channel congestion is avoided.
  • the random access parameters that can be adjusted include: the initial power constant of the random access preamble, the power climbing step of the random access preamble, and any two or three of the maximum number of climbs of the random access preamble.
  • the functions of the recording unit 303, the first comparing unit 304, and the adjusting unit 305 can also be performed by a processor.
  • the embodiment of the present invention may further include a storage unit 307, configured to be used for storage.
  • the initial value of the random access parameter can be set according to the actual value of the network according to the value range specified by the protocol.
  • the function of the storage unit 307 can also be performed by a memory.
  • the base station device adjusts the random access parameter according to the number of times of the acknowledgment message of the random access preamble sent by the user equipment in the cell, and the number of times the acknowledgment message is recorded by the base station device is used.
  • the user equipment can still access the network, and the channel condition of the network has not deteriorated. Therefore, according to the number of acknowledgment messages of the random access preamble, it can be determined in advance whether the channel used by the user equipment to send the random access preamble is congested. Risk, if the risk of channel congestion occurs in the current cell, adjust the random access parameters. It is ensured that before the random access channel is congested, the user equipment can use the optimized random access parameters to send the random access preamble, which can prevent channel congestion and maintain the random access success rate.
  • the random access channel congestion in the cell changes accordingly.
  • the receiving unit 301 is further configured to: receive a random access preamble sent by the at least one user equipment according to the adjusted random access parameter.
  • the first sending unit 302 may be further configured to: after the receiving unit 301 receives the random access preamble sent by the at least one user equipment according to the adjusted random access parameter, to the at least one user The device sends a new acknowledgment message, where the new acknowledgment message indicates that the base station device successfully receives the random access preamble sent by the at least one user equipment according to the adjusted random access parameter.
  • the recording unit 303 may be further configured to record the number of times of the new acknowledgment message; the first comparing unit 304 may be further configured to compare the number of times of the new acknowledgment message with a second threshold, the second threshold And determining, by the at least one user equipment, whether the number of random access preambles sent according to the adjusted random access parameter is within a normal range;
  • the second sending unit 306 may be further configured to: send the random access parameter to the at least one user equipment, when the number of the new acknowledgment message is less than or equal to the second threshold.
  • the first comparison unit 304 is further configured to: when the number of acknowledgment messages is less than the first threshold, compare the number of the acknowledgment messages with a second threshold, where the second threshold is used to determine a random connection initiated by the user equipment. Whether the number of incoming preambles is within the normal range, there is no risk of causing channel congestion.
  • the number of the acknowledgment messages is less than the second threshold, it indicates that the channel is not congested before the current judgment, or the random access parameter adjusted by the user equipment is used to send the random access preamble, and channel congestion has been eliminated.
  • the first comparison unit 304 sends a first indication message to the second sending unit 306, indicating that the storage in the storage unit 307 is sent to the user equipment.
  • the initial value of the random access parameter is the initial value of the random access parameter.
  • the first comparing unit 304 may further send a second indication message to the adjusting unit 305, indicating to stop adjusting the random access parameter.
  • the second sending unit 306 can immediately restore the initial value of the random access parameter to the user equipment, or maintain the adjusted random access parameter to the user equipment. After the preset time has elapsed, the initial value of the parameter is restored.
  • the state of the adjustment parameter is maintained and the preset time is passed. This is to prevent the parameter adjustment step from being stopped in a short time after the parameter adjustment step is started. If this situation occurs frequently, network resources will be wasted. .
  • the second sending unit 306 may further include a timing subunit 3061, configured to record, after the adjusting unit 306 receives the first indication message, maintaining a time for adjusting the state of the random access parameter, when If the recording time exceeds the preset value, stop adjusting the random access parameters.
  • a timing subunit 3061 configured to record, after the adjusting unit 306 receives the first indication message, maintaining a time for adjusting the state of the random access parameter, when If the recording time exceeds the preset value, stop adjusting the random access parameters.
  • the function of the second transmitting unit 306 can also be performed by a transmitter, and the function of the timing sub-unit 3061 can also be performed by a timer.
  • the first comparison unit 304 may send a third indication message to the second sending unit 306, indicating that the current random access parameter is sent. The result of the previous adjustment before the process is adjusted or the initial value of the random access parameter is restored.
  • first indication message the second indication message
  • third indication message are only divided for clarity of presentation, and do not constitute any limitation. Those skilled in the art can understand the meaning of the indication message according to the specification.
  • the user equipment can send a random access preamble through the preset initial value of the random access parameter, shorten the access delay, and adjust the program to improve the efficiency.
  • the recording unit 303 may record the acknowledgement message sent by the base station device to all user equipments in the cell of the base station device. The sum of the times.
  • the base station device can simultaneously process the random access request sent by the different user equipments in the cell. Therefore, the first sending unit 304 can simultaneously send the acknowledgment message of the random access preamble to the multiple user equipments.
  • the first comparing unit 303 compares the total number of the acknowledgment messages with the preset first threshold and the second threshold to learn the channel load condition, determine the channel congestion status, and further, the adjusting unit 305 The access parameters continue to be adjusted.
  • the access parameters can be generally applied to various types of users in a cell, including cell edge users and cell center users.
  • the monitoring unit 308 is further configured to monitor the uplink total bandwidth power RTWP of the cell, and send the monitored RTWP to the second comparing unit 309.
  • the base station device can periodically monitor, or can monitor the RTWPo based on event triggering.
  • the uplink RTWP can reflect the degree of uplink interference of the network and can be used to evaluate the uplink load of the network.
  • the uplink load of the cell is too high caused by the random access process
  • the impact of the random access of the user on the uplink RTWP when the traffic is busy can be reduced, so that the uplink RTWP is in a balanced state.
  • the monitoring period of the uplink RTWP can be selected as Is to improve the power admission control effect of the base station equipment.
  • the second comparison unit 309 is configured to receive the uplink RTWP from the monitoring unit 308, and compare with an RTWP preset threshold. When the uplink RTWP is higher than the RTWP preset threshold, send an indication message.
  • the adjustment unit 305 is given.
  • the threshold value of the uplink RTWP may be automatically determined by the base station device according to network statistics, or an empirical value or an experimental value may be arbitrarily selected according to actual needs.
  • the uplink power load full load of the cell is counted as 100%, and the uplink power load ratio of the preemptive congestion and the adaptive random access parameter optimization algorithm is set to % ( ⁇ >50%), and the corresponding RTWP is calculated.
  • the value is the preset threshold.
  • the adjusting unit 305 is further configured to: receive the indication message sent by the second comparison unit, and receive the indication message sent by the first comparison unit, that is, the uplink RTWP is higher than a preset threshold, and the The number of times the acknowledgment message is greater than or equal to the first threshold, and the random access parameter is adjusted.
  • the functions of the monitoring unit 308 and the second comparing unit 309 may also be performed by a processor, which may be a processor that performs the functions of the recording unit 303, the first comparing unit 304, and the adjusting unit 305.
  • the base station device shown in Figure 4 of the present invention may be the base station device in the embodiment of the random access parameter adjustment method shown in Figure 1 or Figure 2.
  • the base station device shown in Figure 3 may perform Figure 1 or Figure For the method for adjusting the random access parameters shown in FIG. 2, reference may be made to the specific method embodiment shown in FIG. 1 or FIG. 2, and details are not described herein again.
  • the base station device monitors the uplink power load of the cell, and periodically reports the delivery status of the acknowledgment message of the random access preamble, and adjusts the channel congestion condition and the uplink power load value of the cell as a decision basis.
  • Random access parameters It is delivered to the user equipment and used to send the random access preamble.
  • the uplink power load of the cell is reduced under the premise of ensuring the success rate of the random access; and when the uplink power load of the cell is low, the random access parameters are not adjusted, and the short access can be obtained. Access delay.
  • the embodiment of the present invention further provides a base station device. As shown in FIG. 5, the base station device includes:
  • Memory 401 can be used to store instructions that can be used to implement a method of adjusting random access parameters.
  • the method includes: receiving a random access preamble sent by the at least one user equipment according to the random access parameter; after receiving the random access preamble, sending an acknowledgement message to the at least one user equipment, where the acknowledgement message indicates The base station device successfully receives the random access preamble; records the number of times the first sending unit sends an acknowledgement message to the at least one user equipment; compares the number of the acknowledgement message with the first threshold, The first threshold is used to indicate a channel congestion state; when the number of the acknowledgment messages is greater than or equal to the first threshold, the random access parameter is adjusted to obtain the adjusted random access parameter; and the adjusted random access is obtained.
  • the ingress parameter is sent to the at least one user equipment.
  • the processor 402 executes the above instructions stored in the memory.
  • the processor 403 may include a counter 4031 for recording the number of times the acknowledgment message is actually sent to the user equipment.
  • the calculator 4032 is configured to filter the number of times the acknowledgment message is actually sent.
  • a comparator 4033 for confirming the The number of messages is compared to a preset first threshold.
  • the processor 402 may be configured to receive, by the user equipment, the random access preamble by using a random access channel RACH or an enhanced random access channel E-RACH.
  • the processor 402 may be configured to record a sum of the number of times the base station device sends the acknowledgement message to all user equipments in the cell of the base station device.
  • the processor 402 is further configured to: monitor an uplink received total bandwidth power RTWP of the cell, and compare the uplink RTWP with a preset threshold by using the comparator 4033, when the uplink RTWP is higher than the The preset threshold is set and the number of the acknowledgement messages is greater than or equal to the first threshold, and the random access parameter is adjusted.
  • the comparator 4033 is further configured to compare the number of times of the confirmation message of the number of confirmation messages with a second threshold, where the processor 402 stops when the number of times of the confirmation message is lower than the second threshold. And adjusting the random access parameter to restore the initial value of the random access parameter to the at least one user equipment.
  • the processor 403 may send the adjusted random access parameter to the at least one user equipment within a preset time, after the preset time expires, the at least one user is backward.
  • the device delivers an initial value of the random access parameter. Therefore, the processor 403 may further include a timer 4034, configured to record a time when the base station device keeps transmitting the adjusted random access parameter to the user equipment.
  • the base station device shown in Figure 5 of the present invention may be the base station device in the embodiment of the random access parameter adjustment method shown in Figure 1 or Figure 2.
  • the base station device shown in Figure 5 may perform Figure 1 or Figure
  • Related descriptions in the embodiments are not described herein again.
  • the base station device monitors the uplink power load of the cell, and periodically reports the delivery status of the acknowledgment message of the random access preamble, and adjusts the channel congestion condition and the uplink power load value of the cell as a decision basis.
  • the random access parameter is sent to the user equipment and used to send the random access preamble.
  • the uplink power load of the cell is reduced under the premise of ensuring the success rate of the random access; and when the uplink power load of the cell is low, the random access parameters are not adjusted, and the short access can be obtained. Access delay.
  • the embodiment of the present invention further provides a user equipment. As shown in FIG. 6, the sending unit 601 is configured to send a random access preamble to the base station device according to the random access parameter.
  • the receiving unit 602 may receive a random access preamble acknowledgement message sent by the base station device, where the acknowledgement message indicates that the base station device successfully receives the random access preamble; and is configured to receive an adjustment sent by the base station device a random access parameter, the adjusted random access parameter is a confirmation of a random access preamble sent by the base station device to the at least one user equipment in the cell of the base station device recorded by the base station device After the number of times of the message is greater than or equal to the first threshold, the random access parameter is adjusted and sent to the at least one user equipment, where the first threshold is used to indicate a channel congestion state;
  • the sending unit 602 is further configured to send, by using the adjusted random access parameter, a new random access preamble to the base station device.
  • the adjusted random access parameter sent by the base station device is that the number of acknowledgment messages of the random access preamble by the base station device is greater than or equal to a first threshold, and the base station device detects When the uplink received total bandwidth power RTWP is higher than the RTWP preset threshold, the random access parameter is adjusted and sent to the at least one user equipment.
  • the sending unit 602 sends the random access preamble through a random access channel RACH or an enhanced random access channel E-RACH.
  • the function of the receiving unit 601 can also be implemented by a receiver, and the function of the transmitting unit 602 can also be implemented by a transmitting unit.
  • the user equipment provided by the embodiment of the present invention sends a random access preamble by using the random access parameter adjusted by the base station equipment, which can prevent channel congestion and maintain a relatively constant random access success rate.
  • the random access preamble transmits too much to cause channel congestion
  • the random access preamble is transmitted through the adjusted random access parameter, and the pressure of the random access procedure on the data capacity of the random access channel can also be reduced, thereby reducing or even eliminating Channel congestion.
  • each functional module in each embodiment of the present invention may be integrated into one processing module, and each module may exist physically separately, or two or more modules may be integrated into one module.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

L'invention concerne un procédé et un dispositif de réglage de paramètre d'accès aléatoire. Au moyen de statistiques sur la situation délivrée d'un message de confirmation d'un préambule d'accès aléatoire, la situation délivrée est comparée à une valeur seuil préréglée pour déterminer si les préambules d'accès aléatoire envoyés par un équipement utilisateur sont si nombreux qu'un risque d'encombrement de canal peut être causé, et le paramètre d'accès aléatoire est alors automatiquement réglé. L'équipement utilisateur envoie les préambules d'accès aléatoire par le biais d'un paramètre d'accès aléatoire optimisé, de manière à pouvoir prévenir un encombrement de canal et à pouvoir maintenir le taux de succès d'accès aléatoire. En outre, les préambules d'accès aléatoire sont envoyés par le biais du paramètre d'accès aléatoire réglé, la charge de puissance de liaison montante d'une cellule peut être réduite, et l'impact d'un processus d'accès aléatoire sur la capacité de données de liaison montante et le débit de données de liaison montante peut être réduit, ce qui permet d'améliorer la qualité du réseau et d'améliorer l'expérience utilisateur.
PCT/CN2013/089014 2013-12-10 2013-12-10 Procédé et dispositif de réglage de paramètre d'accès aléatoire WO2015085495A1 (fr)

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CN110213834B (zh) * 2017-01-06 2020-09-29 华为技术有限公司 随机接入方法、用户设备和网络设备
CN109194757B (zh) * 2018-09-13 2021-05-04 江苏汉峰数控科技有限公司 基于统计分析的智能物联网机床的控制方法及系统
CN112738839B (zh) * 2019-10-14 2022-07-29 中国移动通信集团山西有限公司 NB-IoT网络容量的评估方法、装置、设备及存储介质
CN112770403B (zh) * 2019-11-01 2023-02-28 鼎桥通信技术有限公司 一种专业数字集群中的随机接入方法和装置
CN110839250B (zh) * 2019-11-01 2023-02-14 Oppo（重庆）智能科技有限公司 Gsm随机接入方法及相关产品

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