WO2011137859A1

WO2011137859A1 - Method, apparatus and system for transmitting information

Info

Publication number: WO2011137859A1
Application number: PCT/CN2011/075065
Authority: WO
Inventors: 舒兵; 秦钧
Original assignee: 华为技术有限公司
Priority date: 2010-07-30
Filing date: 2011-05-31
Publication date: 2011-11-10
Also published as: CN102348253B; CN102348253A

Abstract

A method, an apparatus and a system for transmitting information are disclosed in the embodiments of the present invention. The method includes: a terminal transmits an access request via a Random Access Channel (RACH) in a first time point; one or more time periods, in which access requests are retransmitted via the RACH from a second time point, are determined according to a maximum retransmission wait slot number S, wherein the number of slots in any of the time periods is equal to or more than 2S, and in any two adjacent time periods, the time end of the previous time period is adjacent to the time beginning of the later time period; each time period is divided equally into two sub time periods, wherein the time length of any sub time period is equal to or more than S; one sub time period of the two sub time periods is selected as an access time period; access requests are transmitted via the RACH in the sub time periods which correspond to the access time periods of the one or more time periods. According to the present invention, resource utilization can be performed averagely.

Description

Method, device and system for transmitting information

The present application claims priority to Chinese Patent Application No. 2010 1024 514 9.8, the entire disclosure of which is hereby incorporated by reference in its entirety in its entirety in in. Technical field

The present invention relates to the field of communications technologies, and in particular, to a method, device, and system for transmitting information. Background technique

The terminal establishes communication with the network side, and needs to send a message to the network side through a random access channel (RACH) to apply for a signaling channel. The message sent on the RACH channel may be called a “channel application” or "Access Request" (Channel Request, CR). Because the network side cannot control the time of terminal access, two or more terminals may choose to send a channel request on the same time slot of one RACH channel. This phenomenon may be called a collision phenomenon.

In order to realize the collision, the terminal can also access the network, and there is currently a retransmission mechanism of the channel request. In the retransmission mechanism, if the terminal does not receive an Acknowledgement (ACK) sent by the network side after transmitting the channel request, the terminal may resend the channel request one or more times on the RACH channel. When the terminal sends a channel request multiple times, the number of interval slots sent twice is randomly selected in {S, S+1, ··., S+T-1} with the same probability. Where T is a Tx integer (Tx Integer) parameter broadcasted on a Broadcast Control Channel (BCCH), and the value of S depends on the configuration of the Common Control Channel (CCCH) and the above T value.

As shown in FIG. 1 , in the current retransmission mechanism, the resource utilization rate in the interval of the retransmission time period is not high, and the maximum throughput is not achieved. During the retransmission period, the utilization of resources is uneven. When a large number of users simultaneously send a channel request, the access success rate of resending the channel request after the first access failure is low. SUMMARY OF THE INVENTION Embodiments of the present invention provide a method, an apparatus, and a system for transmitting information. The method, device and system for transmitting information provided by the embodiments of the present invention include the following parts. A method for transmitting information includes: a terminal transmitting an access request through a random access channel at a first time point; and determining, by the maximum retransmission waiting time slot, the second time through the random access channel The point begins to resend one or more time periods of the access request, the second time point is located after the first time point and the number of time slots between the second time point and the first time point is equal to Or greater than the maximum number of retransmission waiting slots, the number of slots in any one of the one or more time segments being equal to or greater than twice the maximum number of retransmission waiting slots, wherein the one Or the time end point of the previous time period of any two adjacent time periods of the plurality of time periods is adjacent to the time start time of the subsequent time period; the terminal will each time of the one or more time periods The segment is divided into two time segments, wherein the time length of any one of the two time segments is equal to or greater than the maximum number of retransmission waiting slots; One of the two time segments is used as an access time period for the terminal to resend an access request on the one or more time periods, where any two adjacent time segments are The time period of the access time period of the terminal is separated by one time segment; the terminal sends the time interval on the time segment corresponding to the access time segment on the one or more time segments. Into the request. The terminal includes: a sending unit, configured to send an access request by using a random access channel at a first time point; and a sending access request time period determining unit, configured to determine, according to the maximum number of retransmission waiting time slots, the random connection The inbound channel retransmits one or more time periods of the access request from a second time point, the second time point being after the first time point and the second time point and the first time point The number of time slots is equal to or greater than the maximum number of retransmission waiting slots, and the number of slots in any one of the one or more time segments is equal to or greater than twice the maximum number of retransmission waiting slots , the time end point of the previous time period of any two adjacent time periods of the one or more time periods is adjacent to the time start time of the latter time period; the time segment segmentation unit is used for Each of the one or more time segments is equally divided into two time segments, wherein a time length of any one of the two time segments is equal to or greater than a maximum number of retransmission waiting slots; an access time segment selecting unit, configured to select one of the two time segments as the terminal resends the access request on the one or more time segments An access period, where the access period of the terminal is separated by a time segment between any two adjacent time segments; the sending unit is further configured to be in the one or more time periods The access request is sent by using the random access channel on the time segment corresponding to the access time period. A communication system comprising: one or more terminals, the terminal being configured to perform the method described above. A method for transmitting information includes: determining a number of users that send an access request on a random access channel; determining a first time slot number information according to a relationship between a number of users and a number of time slots, the first time Gap information The number of users transmitting an access request on the random access channel; transmitting the first slot number information. The access network device includes: a user number determining unit, configured to determine a number of users that send an access request on the random access channel; and a first time slot number information determining unit configured to correspond to the number of time slots according to the number of users And determining, by the first slot number information, the first slot number information indicating a number of users that send an access request on the random access channel, and a sending unit, configured to send the first slot number information.

Homogenization of resource utilization during the time interval in which the access request is resent can be achieved. DRAWINGS

FIG. 1 shows, by way of example, a time period of random access in an existing retransmission mechanism.

Figure 2 shows, by way of example, a schematic diagram of a communication system in one embodiment of the present invention.

FIG. 3 shows, by way of example, a schematic diagram of a method of transmitting information in an embodiment of the present invention. FIG. 4 shows, by way of example, a schematic diagram of a method of transmitting information in another embodiment of the present invention. FIG. 5 shows, by way of example, a method for determining a time period during which a terminal retransmits an access request in an embodiment of the present invention.

Figure 6 is a block diagram showing, by way of example, a method for determining, by a terminal in another embodiment of the present invention, a time period for resending an access request.

Figure 7 shows, by way of example, a schematic diagram of a unit of a terminal in one embodiment of the present invention.

Figure 8 shows, by way of example, a block diagram of an access network device in one embodiment of the present invention. detailed description

Figure 2 shows, by way of example, a communication system 100 in one embodiment of the present invention. The communication system 100 includes at least one access network device 102 and one or more terminals 104 in data communication with the access network device 102. For example, communication system 100 can be located in a GERAN (GSM EDGE Radio Access Network) network. The access network device 102 is located on the network side.

For example, access network device 102 can be a base station, base station controller, or base transceiver station located in a GERAN network, and access network device 102 can communicate with one or more terminals 104.

For example, terminal 104 can receive or transmit wireless signals with a wireless communication device or network. For example, the terminal may be a radio device, a cellular telephone device, a computing device, a personal communication system device, or any other device that is equipped with wireless communication. The terminal 104 may send an access request to the access network device 102 through the RACH channel to apply for a signaling channel, and the network side determines the type of the channel allocated to the terminal 104 according to the access request.

One embodiment of the present invention provides a method of transmitting information by way of example. As shown in Figure 3, the method includes the following sections.

310. The terminal sends an access request through the RACH channel at the first time point. When the terminal needs to establish communication with the network, the terminal sends an access request to the access network device through the RACH channel at the first time point to apply for a signaling channel to the network.

320. According to the maximum number of retransmission waiting slots, the terminal determines one or more time periods for resending the access request from the second time point through the RACH channel. In an embodiment of the present invention, the terminal does not receive an acknowledgement ACK between the first time point and the second time point, and therefore, the terminal needs to resend the access request. For convenience of description, in an embodiment of the present invention, it may be assumed that the one or more time periods are Ti, respectively.

T ₂ Τ _Ν , Ν is an integer, Ν is greater than or equal to 1.

The second time point is located after the first time point and the number of time slots between the second time point and the first time point is equal to or greater than the maximum number of retransmission waiting time slots. The value of the maximum number of retransmission waiting slots depends on the configuration of the Common Control Channel (CCCH) and the Tx integer parameter of the network broadcast on the BCCH. The one or more time periods _Ti, τ ₂ Τ Ν any of a number of time slot period _τ η is at least equal to or greater than twice the maximum number of retransmission wait time slots. And, the time end point of the previous time period of any two adjacent time periods T _k , T _k+ i of the one or more time periods Ti, τ ₂ Τ _相邻 is adjacent to the time start time of the latter time period, i.e. the end of the time period T _k and T _{k + 1} time period starting adjacent. For example, if it is assumed that the T _k time period includes 10 time slots with slot numbers 11 to 20, and the T _k+1 time period includes 10 time slots with slot numbers 21 to 30, then the T _k time period The time end point is the time slot with slot number 20, and the time start point of T _k+1 time period is the time slot with slot number 21.

330. The terminal divides each of the one or more time periods Ti, T ₂ Τ _平均 into two time segments equally. The length of time of any one of the two time segments is equal to or greater than the maximum number of retransmission waiting slots. For ease of description, in the embodiment of the present invention, the one or more time periods Ti, Τ ₂ may be assumed. The two time segments in each time period in T _N are a first time segment and a second time segment, respectively, and the first time segment corresponds to an earlier time segment on the time start point, and the second time segment The segment corresponds to the time segment at which the start of the time is later.

340, the terminal selects a time segment of the time two segments as on the one or more time periods _Ti, T ₂ Τ Ν access time period to resend the access request. The terminal resending the access request on the time interval formed by the one or more time periods T _N may randomly select a time segment as retransmission access on the one or more time periods Ti, τ ₂ Τ _Ν The requested access time period. Correspondingly, for a terminal, between two access time periods of the terminal on any two adjacent time periods of the one or more time periods, a time segment is separated, so that two access time segments are segmented. The length of time between is equal to or greater than the maximum number of retransmission waiting slots. For example, the terminal may randomly select the first time segment in each of the one or more time periods Ti, τ ₂ Τ _作为 as the access time period for resending the access request; correspondingly, the terminal passes the RACH When the channel resends the access request to the access network device, it only transmits on the first time segment of the Ti, T ₂ Τ _Ν time period.

350, in which a terminal or _Ti, T ₂ Τ Ν access time period a time period corresponding to a plurality of time segments sending an access request on the RACH channel. In the embodiment of the present invention, the terminal makes Τι, Τ ₂ by determining Ti, Τ ₂ Τ _Ν and the access time period.

Τ _Ν is a continuous non-overlapping time period, and the time length of any one of Ti, T ₂ Τ _Ν is at least greater than twice the maximum number of retransmission waiting slots, and each time segment is further divided into two Time segmentation, let

Re-transmitting the access request the time interval _Τι, T ₂ Τ Ν consisting terminal selects a time segment as the access time period, can be achieved within the time interval _Ti, T ₂ Τ Ν consisting uniform resource utilization, and That is, there is no time interval that is not utilized in the time interval, and there is no time interval for overlapping use. Another method of transmitting information is provided in one embodiment of the invention. As shown in Figure 4, the method includes the following parts.

410. The terminal receives the first slot number information. The first slot number information indicates the number of users transmitting an access request on the random access channel. For example, the number of the users may be the maximum number of users that send access requests, the number of users in the cell, or the number of users that simultaneously send access requests. The length of time indicated by the first slot number information is the number of slots of one or more slots on the random access channel. In an embodiment, the first number of timeslot information may be sent by the access network device to the terminal. For example, the information that the access network device sends the first time slot number may include: the access network device determines the number of users that send the access request on the random access channel; and accesses according to the relationship between the number of users and the number of time slots. The network device determines the first slot number information; the access network device sends the first slot number information. The access network device may send the first time slot number information to the terminal by sending a message carrying the first time slot number information. For example, the access network device may carry the first time slot number information to the terminal by immediately assigning a message. The access network device performs a corresponding correspondence between the number of users and the number of time slots, and notifies the terminal so that the terminal can determine the time period for resending the access request according to the information of the number of time slots, so that the terminal can be in the determined time period. Achieve throughput of larger resources.

420. The terminal sends an access request by using a random access channel at the first time point. When the terminal needs to establish communication with the network, the terminal sends an access request to the access network device through the RACH channel at the first time point to apply for a signaling channel to the network.

430. According to the maximum retransmission waiting time slot number and the first time slot number information, the terminal determines one or more time periods for resending the access request from the second time point through the RACH channel. In an embodiment of the present invention, the terminal does not receive the acknowledgement ACK between the first time point and the second time point, and therefore, the terminal needs to resend the access request. For convenience of description, in the embodiment of the present invention, it may be assumed that the one or more time periods are respectively Ti, T ₂ Τ _Ν , Ν is an integer, and Ν is greater than or equal to 1. The second time point is located after the first time point and the number of time slots between the second time point and the first time point is equal to or greater than the maximum number of retransmission waiting time slots. The value of the maximum number of retransmission waiting slots depends on the configuration of the Common Control Channel (CCCH) and the Tx integer parameter of the network broadcast on the BCCH. In an embodiment of the present invention, as shown in FIG. 5, the terminal in 430 determines Ti, T ₂ Τ _Ν may include:

432, the first slot number information, the user terminal is determined in accordance with the number 1, D _{₂ Τ Ν} sending an access request by the RACH channel in each time period. Since the first slot number information indicates the number of users transmitting the access request on the random access channel, the terminal can determine the number of users transmitting the access request through the RACH channel.

434. Pass RACH from each time period of Ti, T ₂ Τ _Ν according to the maximum number of retransmission waiting slots. The larger value of the number of users transmitting the access request by the channel and twice the maximum number of retransmission waiting slots is selected as Ti, τ ₂ ... τ _Ν . The one or more time periods _Ti, T ₂ Τ Ν any of a number of time slot period T _k is at least equal to or greater than twice the maximum number of retransmission wait time slots. And, the time end point of the previous time period of any two adjacent time periods T _k , T _k+ i of the one or more time periods Ti, τ ₂ Τ _相邻 is adjacent to the time start time of the latter time period, i.e. the end of the time period T _k and T _{k + 1} time period starting adjacent. Meanwhile, according to the first slot number information, the terminal may _Ti, τ ₂ Τ Ν any of a number of time slot period _τ η is equal to or larger are also the first slot number information indicated by a random access channel The number of users who sent access requests. And, if the number of users is assumed that _Tj, T ₂ Τ Ν any one time on a RACH channel transmitted by the access request is _k T N _k, then, T _k and N _k is twice the maximum retransmission wait time slot The larger one of the numbers, that is, T _k = Max(N _k , 2S). In this embodiment, the terminal makes Ti, T ₂ Τ _Ν continuous by determining Ti, T ₂ Τ _Ν and the access time period. The non-overlapping time period, and the time length of any one of Ti, τ ₂ Τ _Ν is at least greater than twice the maximum number of retransmission waiting slots, and the information greater than or equal to the first number of slots indicates random access The number of users that send access requests on the channel can achieve a higher access success rate when a large number of users concurrently access. In another embodiment of the present invention, as shown in FIG. 6, the terminal in 430 determines Ti, T ₂ Τ _Ν may include:

436, according to the number of the first slot and a first mapping relation information, the terminal determines in _Ti, T ₂ Τ Ν number sent by a user access request RACH channel on each time period. Any of a number of time slots corresponding to the time segment and the number _Τ η any time the user access request sent on the RACH segment _Τ η _₂ Τ _Ν channel mapping relationship in the first representative of TT. When assuming Ti, T ₂

_Τ Ν to any number of users a number of time slot period _Τ η in the first slot number information indicated by the access request sent in a random access channel is relatively seasonal, can improve resource utilization, to a greater The throughput, and when a large number of users concurrently access, can also achieve a higher access success rate. Since it is assumed that the user retransmits each time that the number of slots in the time period corresponds to the number of users transmitting the access request on the time period, N _k = N _k . ₁ (l - P _k . ₁ ) = N ₁ (l - P ₁ )(l - P ₂ )...(l- P _k . ₁ ). P _k-1 represents the access success rate when N _k- i users initiate access in the time period T _k-1 , according to the Poisson distribution law To get: Pk-ι =

In still another embodiment of the present invention, for the purpose of simplifying the calculation, it is assumed that =1, that is, N _k-1 = T _k-1 , at this time, Pk-ι =

N _k = N _k , (lP _k ,) = N ₁ (lP ₁ )(lP ₂ )...(lP _k ,) = ^ ₁ (l--)―.

438. According to the maximum retransmission waiting time slot number and the first mapping relationship, the number of users that send access requests through the RACH and the double maximum retransmission waiting time slots from each time period of Ti, T ₂ Τ _Ν The larger value is selected as Ti, T ₂ Τ _Ν . If it is assumed Τι, a time period of _T ₂ Τ Ν initiating T _k is the number of access users N _k, then the time period _{_{T k = Max (W k,}} 2S). Where s represents the maximum number of retransmission waiting slots. When a further embodiment of the present invention embodiment, in 436, the terminal determines the number of _Ti, T ₂ Τ Ν transmitted through the access channel RACH period on each user, for the purpose of simplified calculation functions, may Hypothesis

From the number of users each time period _Ti, T ₂ Τ Ν of sending an access request by the RACH and twice the maximum number of retransmission wait time slot to select a larger value as _Ti, T ₂ Τ Ν, period

T _k = Max(N _k , 2S) = Max(N) ( 1 -丄) ^kJ , 2S).

e

440. The terminal divides each of the one or more time periods Ti, T ₂ Τ _平均 into two time segments equally.

450. The terminal selects one of the two time segments as an access time period for resending the access request on the one or more time periods Ti, τ ₂ _Ν .

460, or a plurality of terminals in the time period _TT ₂ Τ Ν access time period a time segment corresponding to the access request sent on the RACH channel. The description of the above 440, 450 and 460 can be referred to the description in 330, 340 and 350 in the embodiment shown in FIG. 3, and the description will not be repeated. In the embodiment of the present invention, the terminal determines Ti, τ ₂ Τ _Ν and the access time period by using the received first slot number information, so that Ti, T ₂ Τ _Ν is a continuous non-overlapping time period, and Ti, τ ₂ Τ _任意 Any time period of time is at least twice the maximum number of retransmission waiting slots, and each time period is further divided into two time segments, which are composed of Ti, τ ₂ Τ _Ν re-sending an access request in the time interval terminal selects a time segment as the access time period, can be achieved in Ti, the time interval _τ ₂ Τ Ν composed of uniform resource utilization, i.e. not in the time interval There are time intervals that are not utilized, and there are no time intervals that overlap.

As shown in FIG. 7, an embodiment of the present invention is shown by way of example, and the terminal 700 can complete all the functions of the terminal in the foregoing method embodiment. The terminal 700 can implement all the functions of the terminal in the foregoing method embodiment by using software and/or hardware. For example, the terminal 700 can include one or more processors to implement all the functions of the terminal in the foregoing method embodiment. The terminal 700 may include: a sending unit 710, a sending access request period determining unit 720, a period segmenting unit 730, and an access period selecting unit 740. The sending unit 710 is configured to send an access request by using a random access channel at the first time point. The sending access request period determining unit 720 is configured to determine, according to the maximum number of retransmission waiting slots, one or more time periods for resending the access request from the second time point by using the random access channel, the second The time point is located after the first time point and the number of time slots between the second time point and the first time point is equal to or greater than the maximum number of retransmission waiting time slots, the one or more times The number of time slots in any one of the segments is equal to or greater than twice the number of maximum retransmission waiting slots, wherein the previous one of any two adjacent time segments of the one or more time segments The end of the time of the segment is adjacent to the start of the time of the latter period. The time segment segmentation unit 730 is configured to divide each time segment of the one or more time segments into two time segments, wherein a time length of any one of the two time segments is equal to Or greater than the maximum number of retransmission waiting slots. The access time segment selection unit 740 is configured to select one of the two time segments as an access time segment in which the terminal resends the access request on the one or more time segments, where The access period of the terminal is separated by a time segment between any two adjacent time periods. The sending unit 710 is further configured to: time the corresponding time segment of the access period on the one or more time periods An access request is sent over the segment through the random access channel. In another embodiment of the present invention, the terminal 700 may further include a receiving unit 750. The receiving unit 750 is configured to receive first slot number information, where the first slot number information indicates a number of users that send an access request on a random access channel. The sending access request period determining unit 720 determines, according to the maximum number of retransmission waiting slots, one or more time periods for resending the access request from the second time point through the random access channel, including: according to the maximum weight Transmitting the number of waiting slots and the first number of slots, the terminal determining the one or more time periods. In still another embodiment of the present invention, the terminal 700 may further include a user number determining unit 760. The number-of-users determining unit 760 is configured to determine, according to the first number-of-times information and the first mapping relationship, that the terminal sends the data through the random access channel in each of the one or more time periods. The number of the users entering the request, where the first mapping relationship is that the number of slots on any one of the one or more time segments corresponds to the random access channel on the any one of the time segments. The number of users who sent access requests. The sending access request period determining unit 720 is further configured to: pass the random connection from each of the one or more time segments according to the maximum number of retransmission waiting slots and the first mapping relationship. A larger value is selected as the one or more time periods from the number of users who have transmitted the access request to the channel and twice the number of the maximum number of retransmission waiting slots.

As shown in FIG. 8, an embodiment of the present invention shows an access network device 800, which can perform all the functions of the access network device in the foregoing method embodiment. The access network device 800 can implement all the functions of the access network device in the foregoing method embodiments by using software and/or hardware. For example, the access network device 800 can include one or more processors to implement the foregoing method. In the example, all the functions of the access network device. The access network device 800 may include: a user number determining unit 810, a first time slot number information determining unit 820, and a transmitting unit 830. The number of users determining unit 810 is configured to determine the number of users transmitting the access request on the random access channel. The first slot number information determining unit 820 is configured to determine, according to a one-to-one correspondence between the number of users and the number of slots, the first slot number information indicating that the access is sent on the random access channel. Number of users requested Hey.

The sending unit 830 is configured to send the first slot number information.

One embodiment of the present invention provides, by way of example, a communication system including a terminal. The terminal can complete all the functions of the terminal in the foregoing method embodiment. For details of the specific implementation of the terminal, refer to the description of the foregoing embodiment, and details are not described herein again. Further, in another embodiment, the communication system may further include an access network device. The access network device can complete all the functions of the access network device in the foregoing method embodiments. For details of the implementation of the access network device, refer to the description of the foregoing embodiment, and details are not described herein again. Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is better. Implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium, including a plurality of instructions for making a A computer device (which may be a personal computer, server, or network device, etc.) performs all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. .

In the several embodiments provided herein, it should be understood that the disclosed systems, apparatus, and methods may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separate. The components displayed as units may or may not be physical units, i.e., may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may also be stored in a computer readable storage medium. The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Rights request

A method for transmitting information, comprising: transmitting, by a terminal, an access request through a random access channel at a first time point; and determining, by the terminal, the random connection according to a maximum number of retransmission waiting slots The inbound channel retransmits one or more time periods of the access request from a second time point, the second time point being after the first time point and the second time point and the first time point The number of time slots is equal to or greater than the maximum number of retransmission waiting slots, and the number of slots in any one of the one or more time segments is equal to or greater than twice the maximum number of retransmission waiting slots The time end of the previous one of the two adjacent ones of the one or more time periods is adjacent to the time start of the subsequent time period; the terminal will be the one or more Each time period in the time period is equally divided into two time segments, wherein the time length of any one of the two time segments is equal to or greater than the maximum retransmission, etc. a number of time slots; the terminal selects one of the two time segments as an access time period in which the terminal resends an access request on the one or more time segments, where any two The time segments of the terminal are separated by one time segment on the adjacent time segments; the terminal passes the time segment corresponding to the access time segment on the one or more time segments The random access channel sends an access request.

The method according to claim 1, further comprising: receiving, by the terminal, first slot number information, where the first slot number information indicates a user that sends an access request on a random access channel Number

Determining, according to the maximum number of retransmission waiting slots, the one or more time periods in which the terminal resends the access request from the second time point by using the random access channel, according to the foregoing: The maximum number of retransmission waiting slots and the first number of slots information, the terminal determining the one or more time periods.

The method according to claim 2, wherein, according to the maximum number of retransmission waiting slots and the first number of slots, the terminal determines that the one or more time periods include Determining, according to the first slot number information and the first mapping relationship, the terminal determining a user that sends an access request through the random access channel in each of the one or more time periods The number of the slots in any one of the one or more time periods corresponding to the number of slots in the one or more time segments corresponding to the access request being sent by using the random access channel on the any one of the time segments. The number of users; according to the maximum number of retransmission waiting slots and the first mapping relationship, sending an access request through the random access channel from each of the one or more time segments A larger value is selected as the one or more time periods from the number of users and twice the number of the maximum retransmission waiting slots.

The method according to claim 3, wherein the information according to the first time slot number and the number a mapping relationship, the terminal determining, in each of the one or more time periods, the number of users that send an access request by using the random access channel, according to the first time slot number information And the first mapping relationship and the access success rate of the user, where the terminal determines the number of users that send the access request in the one or more time periods.

A terminal, comprising: a sending unit, configured to send an access request by using a random access channel at a first time point; and a sending access request time period determining unit, configured to wait for a number of time slots according to a maximum retransmission Determining, by the random access channel, one or more time periods for resending an access request from a second time point, the second time point being after the first time point and the second time point being The number of time slots between the first time points is equal to or greater than the maximum number of retransmission waiting time slots, and the number of time slots in any one of the one or more time periods is equal to or greater than twice the maximum Retransmitting the number of waiting slots, wherein the time end of the previous time period of any two adjacent time periods of the one or more time periods is adjacent to the time start time of the latter time period; a unit, configured to divide, into each of the one or more time segments into two time segments, wherein the time of any one of the two time segments is Degree equal to or greater than said maximum number of retransmission wait time slots;

An access time segment selection unit, configured to select one of the two time segments as an access time period for the terminal to resend an access request on the one or more time segments, where The time period of the access time period of the terminal is separated by a time segment between any two adjacent time segments; the sending unit is further configured to use the access time period in the one or more time periods An access request is sent over the random access channel on the corresponding time segment.

The terminal according to claim 5, further comprising: a receiving unit, configured to receive first slot number information, where the first slot number information indicates to send an access request on a random access channel The number of users of the sending access request period determining unit determines, according to the maximum number of retransmission waiting slots, one or more time periods for resending the access request from the second time point through the random access channel, including: And determining, by the terminal, the one or more time periods according to the maximum retransmission waiting time slot number and the first time slot number information.

The terminal according to claim 6, further comprising: a user number determining unit, configured to determine, according to the first slot number information and the first mapping relationship, that the terminal determines the one or more The number of users who send an access request through the random access channel in each time period of the time period, where the first mapping relationship is when the time interval is any one of the one or more time segments The number of slots corresponds to the number of users that send access requests through the random access channel in any one of the time periods; the sending access request period determining unit is configured to use the maximum number of retransmission waiting slots and Transmitting, by the random access channel, the first mapping relationship from each of the one or more time periods A larger value is selected as the one or more time periods from the number of incoming users and twice the number of said maximum retransmission waiting slots.

A communication system, comprising: one or more terminals, the terminal for performing the method of any one of claims 1 to 4.

A method for transmitting information, comprising: determining a number of users that send an access request on a random access channel; determining a number of first time slots according to a relationship between a number of users and a number of time slots - a corresponding number of slots And the first time slot number information indicates a number of users that send an access request on a random access channel; and the first time slot number information is sent.

The method according to claim 9, wherein the transmitting the first slot number information comprises: sending an immediate assignment message, wherein the immediate assignment message comprises the first slot number information.

An access network device, comprising: a user number determining unit, configured to determine a number of users that send an access request on a random access channel; and a first time slot number information determining unit, configured to use, according to the number of users The first slot number information is determined by the one-to-one correspondence of the number of slots, the first slot number information indicating the number of users that send the access request on the random access channel, and the sending unit, configured to send the first Number of slots information.