WO2012062222A1 - Procédé de configuration d'accès retardé, procédé d'accès retardé et dispositif associé - Google Patents

Procédé de configuration d'accès retardé, procédé d'accès retardé et dispositif associé Download PDF

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Publication number
WO2012062222A1
WO2012062222A1 PCT/CN2011/082160 CN2011082160W WO2012062222A1 WO 2012062222 A1 WO2012062222 A1 WO 2012062222A1 CN 2011082160 W CN2011082160 W CN 2011082160W WO 2012062222 A1 WO2012062222 A1 WO 2012062222A1
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Prior art keywords
ccch
channel
access
terminal
gsm network
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PCT/CN2011/082160
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English (en)
Chinese (zh)
Inventor
舒兵
王济勇
房明
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华为技术有限公司
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Publication of WO2012062222A1 publication Critical patent/WO2012062222A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access

Definitions

  • a delay access configuration method, a delay access method, and a related device are required to be submitted to the Chinese Patent Office on January 12, 201, and the application number is
  • the present invention relates to the field of access networks, and in particular, to a method for configuring delayed access, a method for delay access, and related devices. Background technique
  • Machine-to-machine (M2M) communication connects various end devices or subsystems through various communication technologies and aggregates them into a management system to manage and service the devices.
  • M2M Machine-to-machine
  • a huge number of devices ie terminals
  • a large number of terminals may initiate access to the network side at the same time.
  • the sensing devices installed on the bridge sense the passage of the train. These sensing devices are almost simultaneously Send sensor data; for example, when floods cross the police line, there will be a large number of watermark sensors that simultaneously send data.
  • the GSM network which has been used on a large scale, has become one of the choices for terminal interconnection under M2M.
  • MS Mobile Station
  • RACH Random Access CHannel
  • Channel Request CR , Channel Request
  • AGCH Uplink Grant Channel
  • the terminal If the terminal receives the immediate assignment message, the terminal establishes a connection with the network side and performs signaling or data transmission; if the terminal receives the assignment rejection message, the terminal exits the access procedure.
  • the terminal After the terminal sends a CR, if the network side does not receive a response (ACK) to the CR, the terminal will resend the CR on the RACH until the number of transmissions reaches M+1 (M is the maximum number of retransmissions).
  • M is the maximum number of retransmissions
  • the time period of the random delay may be a specific number of time slots. For example, the terminal randomly selects one time slot from the time slot set ⁇ 1, 5, 9, ..., N ⁇ , assuming that the time slot is 100. Then, before the terminal sends the CR to the network side for the first time, it waits for 100 slots before sending. After the CR is sent for the first time, the subsequent retransmission process is the same as the previous mechanism, with no changes.
  • the terminal is a time slot randomly selected from the time slot set as the delay time. Since the maximum value in the time slot set is not strictly determined, the CR is delayed according to the time slot selected from the time slot.
  • the access success rate (ASR) is not guaranteed. For example, the selected time slot is too small (that is, the delay time is too short). Even if the delay is sent, the probability of an access collision is still large. Still can not reach the specified ASR.
  • the embodiment of the invention provides a configuration method for delay access, a delay access method and related devices, so as to strictly determine a delay time and improve the access success rate of the terminal.
  • the embodiment of the present invention provides a configuration method for delay access, including: the network side device obtains the terminal accessing the GSM network according to the number of terminals simultaneously initiating access to the GSM network, the number of common control channels CCCH, and the modified parameters. The required delay value;
  • the network side device sends a time value not less than the delay value to the terminal, so that the terminal sends the channel request CR with a delay that is not greater than the time value.
  • An embodiment of the present invention provides a method for delay access, including: receiving a network side device by a terminal The time value sent;
  • the terminal sends a channel request CR according to the time value and randomly delays for a period of time;
  • the time value is not less than a delay value required by the network side device to access the GSM network according to the modified parameter, the number of terminals that initiate the access to the GSM network, and the number of the common control channel CCCH.
  • the period of the delay is not greater than the specified time value.
  • the embodiment of the present invention provides a network side device, including: a delay value obtaining module, configured to obtain, according to the number of terminals that simultaneously initiate access to the GSM network, the number of common control channel CCCHs, and the modified parameters, obtain the terminal accessing the GSM network.
  • the required delay value configured to obtain, according to the number of terminals that simultaneously initiate access to the GSM network, the number of common control channel CCCHs, and the modified parameters, obtain the terminal accessing the GSM network.
  • the required delay value configured to obtain, according to the number of terminals that simultaneously initiate access to the GSM network, the number of common control channel CCCHs, and the modified parameters
  • a sending module configured to send a time value not less than the delay value to the terminal, so that the terminal sends the channel request CR with a delay that is not greater than the time value.
  • An embodiment of the present invention provides a terminal, including: a receiving module, configured to receive a time value sent by a network side device;
  • a channel request sending module configured to send a channel request CR for a period of time according to the time value
  • the time value is not less than a delay value required by the network side device to access the GSM network according to the modified parameter, the number of terminals that initiate the access to the GSM network, and the number of the common control channel CCCH.
  • the period of the delay is not greater than the time value.
  • the embodiment of the present invention provides a delay access system, including: a network side device and a terminal: the network side device, configured to use the number of terminals that simultaneously initiate access to the GSM network, the number of common control channels CCCH, and the modified parameters. Obtaining a delay value required for the terminal to access the GSM network, and sending a time value not less than the delay value to the terminal, so that the terminal sends a channel request with a delay that is not greater than the time value.
  • CR a delay access system
  • the terminal is configured to receive a time value sent by the network side device, and send a channel request CR according to the time value;
  • the time value is not less than a delay value required by the network side device to access the GSM network according to the modified parameter, the number of terminals that initiate the access to the GSM network, and the number of the common control channel CCCH.
  • the period of the delay is not greater than the time value.
  • the number of terminals that access the GSM network and the number of common control channels CCCH configured for the cell are modified parameters. Based on these factors, the delay value required for the terminal to access the GSM network is strictly obtained, so that the delay time for the terminal to transmit the channel request CR also has a certain upper limit. Therefore, compared with the prior art, the present invention can enable the terminal to send the channel request CR within a reasonable delay time range, thereby avoiding the terminal blindly transmitting the channel request CR and avoiding the terminal waiting for unnecessary (that is, exceeding the reasonable The delay time), at the same time, can also reduce the probability of 'j, access collision, and improve the access success rate.
  • FIG. 1 is a schematic flowchart of a method for configuring delayed access according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a channel combination structure including a CCCH channel according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a channel combination structure including a C CC H channel according to another embodiment of the present invention
  • FIG. 4 is a schematic flowchart of a method for delay access according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a logical structure of a network side device according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a logical structure of a delay access system according to an embodiment of the present invention
  • FIG. 8 is a cumulative distribution function of a terminal in a GSM network cell according to an embodiment of the present invention.
  • the following are connected to terminals in the GSM network, for example, mobile stations (MS, Mobile Station)
  • the GSM network is taken as an example to describe the configuration method of delay access provided by the present invention.
  • FIG. 1 is a schematic flow chart of a method for configuring delayed access according to an embodiment of the present invention. Mainly includes the steps:
  • the network side device obtains a delay value required by the terminal to access the GSM network according to the number of terminals that initiate the access to the GSM network, the number of public control channel CCCHs, and the modified parameters.
  • the network side device may be a base station subsystem (BSS, Base Station Subsystem), including a base station (BTS, Base Transceiver Station) or a base station controller (BSC, Base Station Controller), etc.
  • BSS Base Station Subsystem
  • BTS Base Transceiver Station
  • BSC Base Station Controller
  • the terminal may be a mobile station MS
  • the modified parameters are connected to the terminal.
  • the access success rate of the GSM network is related. For example, if the access success rate of the terminal to access the GSM network is greater, the correction parameter should also be larger.
  • the discrete access success rate may correspond to the modified parameter, but also the access success rate and the correction parameter in a continuous value range.
  • the correction parameters can be Pml and Pm2 respectively (here, Pm2 is greater than Pml); the access success rate is [Aasr ⁇ > Basr] And [Casr, Dasr] (here, Basr is greater than Aasr, Casr is greater than Basr, Dasr is greater than Casr), the correction parameters can be Pm3 and Pm4 (here, Pm4 is greater than Pm3).
  • the correction parameter can be taken as 6.25.
  • the number of all terminals in the GSM network cell may be roughly estimated as the number of terminals simultaneously initiating access to the GSM network; if more precise, the number of users in a certain level in the cell may also be calculated.
  • the number of users is used as the number of terminals that initiate the access to the GSM network at the same time, for example, the number of all meter reading terminals in the cell in the M2M application, or the network side estimates the short time (for example, 1 second or 1 minute, etc.)
  • the number of users that may initiate access, and the number of users is used as the number of terminals simultaneously initiating access to the GSM network.
  • the delay value may be expressed by using the number of slots, that is, calculating the delay calculated by the network side device according to the modified parameter, the number of terminals simultaneously initiating access to the GSM network, and the number of common control channels CCCH.
  • the unit of value is the time slot.
  • the delay value means that the terminal needs to delay the time indicated by the delay value to send the CR, and the access success rate of accessing the GSM network can reach the specified requirement.
  • the network side device sends a time value not less than the delay value to the terminal.
  • the time value transmitted by the network side device not less than the delay value obtained in step S101 can also be represented by the number of time slots.
  • the delay value calculated by the network side device according to the modified parameter, the number of terminals that initiate the access to the GSM network, and the number of the common control channel CCCH is 100 time slots
  • the time value sent by the network side device to the terminal is For 100 time slots, the time value transmitted by the network side device to the terminal may also be larger than 100 time slots, for example, 110 time slots.
  • the terminal may randomly select the access success rate of accessing the GSM network when the delay is one time to reach the specified requirement.
  • the terminal since the network side device is based on the modified parameter, the number of terminals that initiate the access to the GSM network, and the number of common control channels CCCH configured for the cell, the terminal is strictly obtained after considering these factors.
  • the delay value required to enter the GSM network, and thus the delay time for the terminal to transmit the channel request CR also has a determined upper limit. Therefore, compared with the prior art, the present invention can enable the terminal to send the channel request CR within a reasonable delay time range, thereby avoiding the terminal blindly transmitting the channel request CR and avoiding the terminal waiting for unnecessary (that is, exceeding the reasonable The delay time), at the same time, can also reduce the probability of 'j, access collision, and improve the access success rate.
  • the access procedure is related to the uplink random access channel (RACH, Random Access CHannel) and the downlink grant channel (AGCH) of the CCCH channel, that is, the access of the terminal is closely related to the resources of the RACH and the AGCH.
  • RACH Random Access CHannel
  • AGCH downlink grant channel
  • the network side device will be more likely to assign the terminal, so the success rate of the entire access process of the terminal will be higher. Otherwise, the access success rate will be The lower, therefore, the following can be combined with the CCCH channel structure to illustrate the configuration method of the delay access of the present invention.
  • the uplink of the CCCH channel is composed of RACH, and the downlink is composed of PCH and AGCH.
  • the uplink channel and the downlink channel are composed of 51 TDMA frames to form a multiframe.
  • FIG. 2 it is a schematic diagram of a channel combination structure including a CCCH channel according to an embodiment of the present invention.
  • the numbers 0 to 50 in the figure indicate 0th to 50th Time Division Multiple Access (TDMA) frames.
  • TDMA Time Division Multiple Access
  • Such a channel is composed of a frequency correction channel (FCCH, Frequency Correct CHannel), a synchronization channel (SCH, Synchronization CHannel), and a broadcast control channel (BCCH, Broadcast).
  • FCCH Frequency Correct CHannel
  • SCH Synchronization CHannel
  • BCCH broadcast control channel
  • Control CHannel is combined with a common control channel (CCCH, Common Control CHannel), and uses "FCCH + SCH + BCCH + CCCH” to indicate that the broadcast control channel BCCH and the common control channel CCCH are combined into a channel (using "FCCH +BCCH”
  • FCCH +BCCH The representation is the same as the combined channel "FCCH + SCH + BCCH + CCCH", wherein the 51 uplink frame consists of 51 RACH access frames ("R" is used in the figure) and the downlink channel includes 9 downlinks.
  • CCCH block (“C” flag is used in the drawing)
  • each downlink CCCH block is composed of 4 TDMA frames.
  • FIG. 3 is a schematic diagram of a channel combination structure including a CCCH channel according to another embodiment of the present invention, where numbers 0 to 50 represent 0 to 50 TDMA frames.
  • a channel is composed of a frequency correction channel FCCH, a synchronization channel SCH, a broadcast control channel BCCH, a common control channel CCCH, four independent dedicated control channels (SDCCH, Stand-alone Dedicated Control CHannel), and four slow associated control channels (SACCH).
  • FCCH frequency correction channel
  • BCCH broadcast control channel
  • BCCH broadcast control channel
  • CCCH common control channel
  • SDCCH Stand-alone Dedicated Control CHannel
  • SACCH slow associated control channels
  • each downlink CCCH block consists of 4 TDMA frames.
  • the downlink CCCH block of the CCCH channel can be used as a paging channel (PCH, Paging Channel) or an immediate assignment channel (AGCH, Access Grant Channel), and the specific configuration is passed through the system.
  • the network device initiated the number of terminals simultaneously access the GSM network, the number of common control channel CCCH and the correction parameter to obtain the desired delay value to access the GSM network terminal M; 1 ⁇ , where
  • the modified parameter Pm is related to the access success rate of the terminal accessing the GSM network. The greater the access success rate of the terminal to access the GSM network, the larger the correction parameter should be.
  • the network device calculates the delay value required for the terminal to access the GSM network.
  • the network device calculates the delay value required for the terminal to access the GSM network as N _ Devices x P m x 9 N _ Devices x P m x 3
  • each of the assignment blocks contains less than 4 TDM A frames, that is, each assignment block is used to assign multiple users, without loss of generality, the network device calculates The delay required for the terminal to access the GSM network is M.
  • N_Devices, Pm, and N_CCCHs have the same meaning as when all downlink CCCH blocks of the CCCH channel are used to assign users, and N is the number of users assigned to each assigned block.
  • the cumulative distribution function (CDF, Cumulative distribution function) in the GSM network cell according to the embodiment of the present invention in the cumulative distribution function, the horizontal axis is the carrier to interference ratio of the terminal (CIR, Carrier to Interference Ratio) ), the vertical axis is the proportion of terminals with corresponding CIR in the cell.
  • CDF Cumulative distribution function
  • the maximum number of retransmissions of the CR by the network side device is set to 4, and the access success rate (ASR) of the terminal accessing the GSM network is not less than 97%.
  • N_Devices is the number of terminals on a common control channel CCCH in the GSM network cell, and the unit of N_DelaySlots is represented by a time slot.
  • the network side device calculates a time value (in units of time slots) according to the inequality expression of the inequality (1). For example, the time for transmitting CR in 100 time can be arbitrarily selected between 0 and 100 time slots.
  • the network side device may also send a time value (in units of time slots) larger than the right expression of the inequality (1) inequality to the terminal. For example, if the inequality (1) inequality expression is 100, the time of sending the CR may be Choose between 0 and 110 time slots.
  • inequality (2) has the same meaning as the same parameter in inequality (1), where N_CCCH S is the number of common control channels CCCH configured for the GSM network cell.
  • inequality (1) can be regarded as 1 ⁇ _ of inequality (2). 0:1 ⁇ takes 1, that is, a special case when the common control channel CCCH of the GSM network cell configuration is 1.
  • the network side device calculates a time value (in units of time slots) according to the expression in the inequality of inequality (2), for example, 80 time slots. Then, when the network side device sends the time values of the 80 time slots to the terminal, The time when the terminal delays transmitting CR can be arbitrarily selected between 0 and 80 time slots.
  • the network side device may also send a time value (in units of time slots) larger than the expression on the right side of the inequality (1) of the inequality (1), for example, assuming that the inequality (2) of the inequality expression is 80, the time of sending the CR may be delayed. Choose between 0 and 90 time slots.
  • Inequalities (1) and inequalities (2) are obtained on the premise that all downlink CCCH blocks of the CCCH channel are used to assign users, that is, all downlink CCCH blocks of the CCCH channel are used as AGCH.
  • the downlink CCCH block of the CCCH channel can be used both as a PCH and as an AGCH. If a part of the downlink CCCH block in the downlink CCCH block of the common control channel CCCH is used to assign a user, that is, a part of the downlink CCCH block of the common control channel CCCH is used as the AGCH, and another part of the downlink CCCH block is used as the PCH, the inequality (2) is further corrected. for:
  • the N_Agchs are related to the parameter BS_AG_BLKS_BES configured on the network side, as follows:
  • the value of the N_DelaySlots configured by the network side device can refer to Table 1 (the channel combination illustrated by FIG. 2) Obtained) and Table 2 (the channel combinations illustrated in Figure 3 are obtained;).
  • inequalities (1), (2), and (3) are obtained based on each assignment block for assigning a user.
  • inequality (3) is corrected to:
  • N is the number of users assigned to each assignment block.
  • the network side device calculates a time value (in units of time slots) according to the expression in the inequality of inequality (4), for example, 120 time slots, then the network side device sends the time values of the 120 time slots to In the terminal, the time when the terminal delays transmitting CR can be arbitrarily selected between 0 and 120 time slots.
  • the network side device may also send a time value (in the time slot) larger than the expression on the right side of the inequality (4) inequality to the terminal. For example, if the inequality (4) is not equal to the right side of the table end, the terminal delays sending the CR time. It can be arbitrarily selected between 0 and 140 time slots.
  • the foregoing embodiment describes the action of the network side device in the configuration method of the delayed access.
  • the following embodiment illustrates the method of delay access by using a terminal, for example, a mobile station (MS, Mobile Station).
  • MS Mobile Station
  • a schematic flowchart of a method for delay access includes the following steps:
  • the terminal receives a time value sent by the network side device.
  • the channel request CR is not immediately sent, but the time value sent by the network side device is received.
  • the terminal sends a channel request CR for a period of time according to a time value sent by the network side device.
  • the time value sent by the network side device is not less than the delay value required by the network side device to calculate the terminal accessing the GSM network according to the modified parameter, the number of terminals that initiate the access to the GSM network, and the number of the common control channel CCCH.
  • the delay is not longer than the specified time value.
  • the network side device calculates the delay value required for the terminal to access the GSM network according to the modified parameter, the number of terminals that simultaneously initiate access to the GSM network, and the number of common control channel CCCHs. ⁇ N _ Devices x P m x 9 where N Dev i ces is the
  • N_CCCHs is the number of the common control channel CCCH
  • N_Agchs is the number of assigned blocks in the partial downlink CCCH block for assigning users, where N is The number of users assigned by each of the assigned blocks.
  • the delay value is N - DevieesxPm , on the channel FCCH + SCH + BCCH + CCCH +
  • the delay value is ⁇ NC CCHs ⁇ .
  • N CCCHs is N_CCCH S xN_Ag C h S xN where N is 1 and N_Agchs is 9 (for example, 9 downlink CCCH blocks in the channel combination illustrated in FIG. 2 are all used to refer to
  • N_CCCHsxN_AgchsxN is a special case where N is 1 and N_Agchs is 3 (for example, all of the 3 downlink CCCH blocks in the channel combination illustrated in FIG. 3 are used to assign one user).
  • each assignment block is used to assign multiple users, there is no loss of generality, whether it is the channel combination of the example of FIG. 2 or FIG. 3, the delay value is M ; ⁇ .
  • the delay value, the network side device transmission time value, and the terminal random delay time period are all represented by time slots. For example, suppose that the maximum number of times that the network side device sets the terminal to retransmit CR is 4, the access success rate of the terminal accessing the GSM network is not less than 97%, and the correction parameter Pm is 6.25.
  • the delay value required by the network side device to access the GSM network according to the modified parameter Pm, the number of terminals N_Devices that simultaneously initiate access to the GSM network, and the number of common control channel CCCHs N_CCCHs are 625 time slots, then When the network side device sends the time value of the 625 time slots to the terminal, the terminal delays sending the CR for a period of time in the time slot set ⁇ 1, 2,
  • the terminal since the terminal delays transmitting the CR for a certain period of time, for example, 625 time slots, the terminal does not wait for a wait when sending the CR delayed, for example, waiting for 1200 times.
  • the CR is sent after the gap.
  • the network side device may also send a time value (in units of time slots) larger than the calculated delay value to the terminal. For example, if the calculated delay value is 625 time slots, the network side device may also be 690.
  • the time delay for the terminal to transmit the CR may be arbitrarily selected in the time slot set ⁇ 1, 2, 3, 625..., 690 ⁇ .
  • FIG. 5 it is a schematic diagram of a logical structure of a network side device according to an embodiment of the present invention. For the convenience of description, only parts related to the embodiment of the present invention are shown.
  • the network side device shown in Figure 5 includes a delay value acquisition module 501 and a transmission module 502, where:
  • the delay value obtaining module 501 is configured to use, according to the number of terminals that simultaneously initiate access to the GSM network, The number of common control channel CCCHs and the correction parameters obtain the delay values required by the terminal to access the GSM network.
  • the network side device calculates the delay value required for the terminal to access the GSM network according to the modified parameter, the number of terminals that simultaneously initiate access to the GSM network, and the number of common control channel CCCHs. ⁇ N _ Devices x P m x 9 _ , where N Dev i ces is the
  • N_CCCHs is the number of the common control channel CCCH
  • N_Agchs is the number of assigned blocks for assigning users in the part of the downlink CCCH block, where N is The number of users assigned by each of the assigned blocks.
  • the delay value is N - Deviees x Pm , in channel FCCH + SCH + BCCH + CCCH +
  • the delay value is N - evices xp m x - .
  • the delay value N _ Devices x P m is N _ Devices x P m x 9 where N is
  • N _CCCHs N _ CCCHs x N _ Agchs x N N_Agchs is 9 (for example, 9 downlink CCCH blocks in the channel combination illustrated in Figure 2 are all used for assignment
  • N - DeviceS x P m x 3 is ⁇ N _ Devices x P m x 9 _
  • N is 1 and N_Agchs is 3 (for example, the 3 downlink CCCH blocks in the channel combination illustrated in Figure 3 are all used to assign a user).
  • the delay value is M N _ ⁇ CC-C ⁇ Hs v x ic N ' s _ x A m gc > lh 9 sx M .
  • the sending module 502 is configured to send a time value of the time delay value to the terminal
  • FIG. 6 is a schematic diagram of a logical structure of the terminal according to the embodiment of the present invention. Only the parts related to the embodiment of the present invention are shown.
  • the terminal shown in FIG. 6 includes a receiving module 601 and a channel request sending module 602, where:
  • the receiving module 601 is configured to receive a time value sent by the network side device.
  • the channel request sending module 602 is configured to send a random delay according to the time value.
  • the time value is not less than a delay value required by the network side device to access the GSM network according to the modified parameter, the number of terminals that initiate the access to the GSM network, and the number of the common control channel CCCH.
  • the period of the delay is not greater than the time value.
  • the delay value can be , where ⁇ Devices
  • N_ is the number of terminals simultaneously initiating access to the GSM network
  • Pm is the modified parameter
  • N_CCCHs is the number of the common control channel CCCH
  • N_Agchs is the assigned block for assigning users in the part of the downlink CCCH block The number, N is the number of users assigned to each of the assigned blocks.
  • FIG. 7 is a schematic diagram of a logical structure of a delay access system according to an embodiment of the present invention. For the convenience of description, only parts related to the embodiment of the present invention are shown.
  • the system includes a network side device 701 as illustrated in Figure 5 and a terminal 702 illustrated in Figure 6, wherein:
  • the network side device 701 is configured to obtain, according to the number of terminals that initiate the access to the GSM network, the number of the common control channel CCCH, and the modified parameter, the delay value required by the terminal to access the GSM network, and send a not less than the delay. a time value of the time value to the terminal 702, so that the terminal sends a channel request CR with a delay not greater than the time value;
  • the terminal 702 is configured to receive a time value sent by the network side device 701, and send a channel request CR for a period of time according to the time value.
  • the time value is not less than the terminal access of the network side device calculated according to the modified parameter, the number of terminals simultaneously initiating access to the GSM network, and the number of common control channel CCCHs.
  • the delay value required by the GSM network, the period of the delay is not greater than the time value.
  • the delay value may be ⁇ _ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ , where N _ DeviceS is the number of terminals simultaneously initiating access to the GSM network, and Pm is the modified parameter.
  • N_CCCHs is the number of CCCHs of the common control channel
  • N_Agchs is the number of assigned blocks in the partial downlink CCCH block for assigning users
  • N is the number of users assigned to each of the assigned blocks.
  • the program can be stored in a computer readable storage medium.
  • the storage medium can include: Read Only Memory (ROM), Random Access Memory (RAM), disk or optical disk.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

Des modes de réalisation de l'invention concernent un procédé de configuration d'accès retardé, un procédé d'accès retardé et un dispositif associé permettant de déterminer de façon stricte un temps de retard et d'améliorer le taux de réussite d'accès d'un terminal. Selon ce procédé : un dispositif côté réseau obtient, en fonction du nombre de terminaux initiant simultanément l'accès à un réseau GSM, du nombre de canaux de commande communs (CCCH) et d'un paramètre de correction, une valeur de retard nécessaire à un terminal pour accéder au réseau GSM ; et le dispositif côté réseau envoie au terminal une valeur temporelle non inférieure à la valeur de retard, de sorte que le terminal envoie une demande de canal assortie d'un retard non supérieur à la valeur temporelle. Par rapport aux antériorités, la présente invention permet au terminal d'envoyer la demande de canal sur une plage de temps de retard raisonnable, ce qui évite non seulement que le terminal envoie la demande de canal à l'aveugle, mais évite également une attente inutile (à savoir supérieure au temps de retard raisonnable) pour le terminal. L'invention permet également de réduire la probabilité de survenue de collisions d'accès et d'améliorer le taux de réussite d'accès.
PCT/CN2011/082160 2010-11-12 2011-11-14 Procédé de configuration d'accès retardé, procédé d'accès retardé et dispositif associé WO2012062222A1 (fr)

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