CN101841776A - Communication method and device for supporting low-rate user terminal - Google Patents

Communication method and device for supporting low-rate user terminal Download PDF

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Publication number
CN101841776A
CN101841776A CN201010176811A CN201010176811A CN101841776A CN 101841776 A CN101841776 A CN 101841776A CN 201010176811 A CN201010176811 A CN 201010176811A CN 201010176811 A CN201010176811 A CN 201010176811A CN 101841776 A CN101841776 A CN 101841776A
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China
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user
user terminal
assignment message
interface
free resources
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CN201010176811A
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CN101841776B (en
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吴勇
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/12Dynamic Wireless traffic scheduling ; Dynamically scheduled allocation on shared channel
    • H04W72/1205Schedule definition, set-up or creation
    • H04W72/121Schedule definition, set-up or creation for groups of terminals or users
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/08User group management

Abstract

The invention discloses a communication method and a communication device for supporting a low-rate user terminal. The method comprises the following steps of: allocating different monitoring periods for each previously allocated user group, wherein the user group comprises at least one user terminal; allocating an air interface resource to a user terminal in the user group in the current monitoring period; and performing data transmission by using the air interface resource and the user terminal in the user group in the current monitoring period. By grouping a large number of user terminals, the system resource can be grouped and allocated to the user terminals of each group in a time multiplexing mode; and therefore, the method and the device improve the utilization ratio of the system resource, support to provide services for a greater number of user terminals and reduce the processing load and the energy consumption of the user terminal.

Description

A kind of communication means and device of supporting low-rate user terminal
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of communication means and device of supporting low-rate user terminal.
Background technology
Adopting OFDMA (Orthogonal Frequency Division Multiplexing, OFDM) in the mobile communication system, to each user terminal, no matter be domestic consumer's terminal or low-rate user terminal, all must send resource allocating message notifies it to use corresponding interface-free resources, for example, service resources and control resource.When the user terminal number increases gradually in the system, system need send a large amount of corresponding interface-free resources of assigned resources message informing user terminal, and in order to keep the communication quality with user terminal, system also needs to carry out channel measurement and reporting measurement result for user terminal distributes a large amount of channel resources for user terminal, has taken a large amount of overheads thus.
In the prior art, the design capacity of each sub-district is different in the different communication systems, the general support provides service simultaneously to several to tens maximum more or less a hundred user terminals, such as contained fan in the gsm system can be 7-8 subscriber terminal service simultaneously, contained fan can be the subscriber terminal service about 20-30 simultaneously in the cdma system, contained fan can be the subscriber terminal service about 50-60 simultaneously in the WCDMA system, contained fan can be the subscriber terminal service about 80-120 simultaneously in the WiMAX system of 10M bandwidth, and contained fan also can be the subscriber terminal service of 80-120 about individual simultaneously in the LTE system of 10M bandwidth.In addition, the user terminal speed that can support in the different communication systems is also different, and for example, the peak value downstream rate of a user terminal can reach 3.1Mbps in the cdma system, and on average the transmission rate of each user terminal is about 100Kbps; The peak value downstream rate of a user terminal can reach 384Kbps in the R99 of the WCDMA system version, and on average the transmission rate of each user terminal is about 50Kbps; The peak value downstream rate of a user terminal can reach 14.4Mbps in the WCDMA system HSDPA version, and on average the transmission rate of each user terminal can reach about 1Mbps.Therefore, the sub-district of existing communication system is designed with relative higher data speed at less relatively user terminal capacity, and it mainly is in order to satisfy the needs of human moving speech communication and mobile data services.
When the communication that present mobile communication system is applied between the low-rate user terminal, M2M (Machine to Machine for example, during machine to machine) communication, the inventor finds, when there was a large amount of low-rate user terminals in present mobile communication system, the expense of system was excessive, and the level of resources utilization is low, can not give full play to the designed capacity of system, equally also reduce the user terminal number that system can hold simultaneously.
Summary of the invention
The embodiment of the invention provides a kind of communication means and device of supporting low-rate user terminal, and existing scheme overhead is big to solve, the problem of restriction user terminal number.
For this reason, the embodiment of the invention adopts following technical scheme: a kind of communication means of supporting low-rate user terminal comprises:
Be the different listening period of pre-assigned each user's set of dispense, described user's group comprises at least one user terminal;
For the user terminal in the user's group that is in current monitoring period distributes interface-free resources;
Carry out transfer of data by described interface-free resources and user terminal in the user group that is in current monitoring period.
A kind of communicator of supporting low-rate user terminal comprises:
The listening period allocation units are used to the different listening period of pre-assigned each user's set of dispense, and described user's group comprises at least one user terminal;
The resource assignation unit is used to the user terminal in the user's group that is in current monitoring period to distribute interface-free resources;
Data transmission unit is used for carrying out transfer of data by described interface-free resources and the user terminal that the user who is in current monitoring period organizes.
As seen, the embodiment of the invention is with a large number of users end packet, system resource is distributed to the user terminal of each user's group according to time-multiplexed mode, thereby improve the utilization ratio of system resource, support provides service for more substantial user terminal number, reduces the processing load and the energy consumption of user terminal.
Description of drawings
Fig. 1 is the communication means flow chart of a large amount of low-rate user terminals of embodiment of the invention support;
Fig. 2 is the communicator schematic diagram of a large amount of low-rate user terminals of embodiment of the invention support.
Embodiment
The embodiment of the invention provides a kind of communication means and device of supporting low-rate user terminal, this method or device can satisfy the communication requirement of low-rate user terminal, and under the prerequisite of the physical-layer techniques such as channel architecture of not revising existing mobile communication system, can reduce the expense of system.
Referring to Fig. 1, the communication means flow chart of a large amount of low-rate user terminals of support that provide for the embodiment of the invention may further comprise the steps:
S101: be the different listening period of pre-assigned each user's set of dispense, described user's group comprises at least one user terminal;
S102:, particularly, carry out the distribution of interface-free resources by assignment message for the user terminal in the user's group that is in current monitoring period distributes interface-free resources;
S103: carry out transfer of data by described interface-free resources and user terminal in the user group that is in current monitoring period.
As seen, the embodiment of the invention is divided into user's group with a large number of users terminal, communicate with user terminal in the different user group at different listening periods, promptly realize system resource is distributed to user terminal in each user group according to time-multiplexed mode, thereby improve the utilization ratio of system resource, support provides service for more substantial user terminal number, reduces the processing load and the energy consumption of user terminal.
Need to prove, the embodiment of the invention is applicable to the system of various low rate communications, except the M2M system, also comprise the system that the person to person communicates by letter and the system of people and machine communication, as long as the user terminal in this system is not high especially to the capacity of the relative whole system of rate requirement.
Wherein, the implementation of step S102 has multiple:
(1) single assignment
Under the default situations, the base station sends an assignment message at each user terminal in user's group and distributes interface-free resources.
(2) group assignment
For conserve bandwidth, the embodiment of the invention proposes especially, the base station can dispose interface-free resources by the mode of " group assignment ", the assignment of so-called group is meant, organize assignment message of transmission to each user, in assignment message, the concrete interface-free resources of clearly organizing the distribution of interior each user terminal for this, particularly, can adopt the mode of " group index+user terminal identification " to divide into the interface-free resources that each user terminal distributes, user terminal is defined as the interface-free resources of self distributing by group index and user terminal identification.If distribute interface-free resources with group assignment mode to user terminal, the base station will be notified user terminal grouping information by space interface signaling after to end packet, and at this moment, each user's group can be distinguished by group number in the base station.
In addition, preferably, above-mentioned assignment message also can send to user terminal in each user group by the bitmap mode, according to default order, each user terminal is known its position and resource size at whole Resource Block, can reduce the expense of assignment message in this way effectively.
In addition, in acquiescence generally, assignment message in above-mentioned two kinds of implementations all is instant assignment message, effectively instant, article one, assignment message only distributes a certain resource of corresponding frame to use once to the user, user terminal only can take the resource that base station assigns is given this user terminal after receiving assignment message, just do not return this user terminal to use in this resource of next cycle, needs to send in addition assignment message again.
The bandwidth occupancy that causes for fear of repeatedly sending assignment message, the special proposition of the embodiment of the invention has also proposed a kind of, can adopt the mode of " continuing assignment ", promptly, by arranging with user terminal, effective in the lasting a plurality of assignment periods of assignment message, for example, the interface-free resources that assignment message distributes can continue several cycles, and this situation is very common in mobile communication; Such as speech business or VoIP business, the every 20ms of voice packet sends once, when two people converse, on average everyone speak at every turn the time 500ms or more than, from the angle of system, can distribute a resource for it like this every 20ms (5ms is a frame, is exactly 4 frames), continuous dispensing 25 times is more than the promptly lasting 500ms; To continuing assignment, the resource number of distribution and Cycle Length can be carried in the assignment message or by agreement arranges.
Particularly, in the time period of agreement or till the interface-free resources number that distributes expired, this instant assignment message all was effectively, that is to say, continues assignment message at a user terminal, indicate the method for salary distribution of a group or a string resource.Particularly, the field of about fixed cycle or time period is carried by assignment message in the base station, the Cycle Length of notifying terminal assignments message to continue.As previously mentioned, if give the user terminal Resources allocation with group assignment mode, the base station will be notified user terminal grouping information by space interface signaling in grouping, and at this moment, each user terminal group can be distinguished by group number in the base station.
The implication that continues assignment is the interface-free resources that an assignment message can a plurality of cycles of assignment, the mode of the assignment message that it is instant relatively, the expense that can save assignment message.Specifically, system can distribute certain piece resource of a certain frame for certain user, and the cycle according to per 100 frames of specifying then allows this user fix this resource of use, 10 times altogether; Like this, from current assignment frame, suppose that current frame number is 100, this assignment message just indicates the user can use this piece resource of the 100th, 110,120,130,140,150,160,170,180,190 frames.One group or a string resource are represented by the assignment Cycle Length field that continues assignment message and carry, generally are exactly the number of assigned resources.
Group assignment by above-mentioned introduction can effectively reduce the number of assignment message or/and continue the mode of assignment, thus further conserve bandwidth resource.
With an instantiation scheme is described in detail below.
1) base station is divided into different user's groups with user terminal, and each user's group comprises a user terminal at least.
The base station can be according to time sequencing, radio environment information, the end user terminal ability information of end user terminal connecting system, and self load condition of base station system etc., user terminal is divided into corresponding user's group flexibly.The size of user's group and number are determined flexibly according to the capacity specifications of the user terminal of the maximum number of system loading, current access user terminal number and system's preparation support.
User terminal is divided into corresponding user organizes mainly and finished by the base station, the information of base station self record user group get final product, is all distributed unitedly to user terminal by the base station owing to all resources, does not generally need informing user terminal.
For the common assignment mode of acquiescence, the base station can be distinguished user's group and notify each user terminal by formulate time-multiplexed Sleep sleep cycle parameter for the user terminal of different user groups; The listening period of each group has nothing in common with each other, and the sleep parameters of the user terminal in a user organizes all is identical; For group assignment mode, because user terminal has received the grouping information (comprising packet number) that the base station sends, therefore, the base station can be distinguished the user terminal group and notifies in each user terminal group to indicate by group index or user terminal and distinguish user terminal by packet number (Group No).
Such as, system need support 5000 user terminals in a sub-district, user terminal can be divided into 100 groups, each user organizes 50 user terminals;
The group number that can define 0-99 indicates each user's group respectively; Also can distinguish each user's group by definition sleep cycle parameter, such as supposing the system 5ms is a frame, with the 10s=2000 frame is an assignment period, each user group is used resource in the monitoring/available period of 20 frames and other 99 the time-multiplexed current assignment periods of group in this assignment period.
2) base station is the different listening period of each user's set of dispense, and is that by assignment message the user terminal in user's group distributes interface-free resources, and is utilized as interface-free resources and this user terminal that this user terminal distributes and carries out transfer of data.
User terminal in each user organizes is in system gives the time of other set of dispense resources, the situation that can keep state of activation monitoring system message or other sub-districts of monitoring system, also can enter dormancy (Sleep) state discord system and carry out alternately, thereby save energy consumption.
The base station is that user terminal distributes interface-free resources by sending assignment message, and the resource that different user groups is used is multiplexing in time, and the user terminal of each user's group can only be distributed to the resource of oneself at the special time using system; System can be in a periodic manner or event mode be the user terminal Resources allocation of each user's group.
For time-multiplexed understanding, illustrate as follows in the mode of single assignment: suppose that each user organizes and use 20 frame resources, 100 groups altogether, 0-19 frame resource is the 0th group of use so, and 20-39 frame resource is the 1st group of use; The rest may be inferred; Because assignment message is only described the resource allocation of present frame and is given which user terminal, so from the angle of the assignment message of eating dishes without rice or wine, the resource of each cycles 20 frame is by so time-multiplexed or shared use of many groups.
After distributing interface-free resources, the base station can be utilized as the interface-free resources of user terminal distribution and carry out transfer of data with it.
In addition, the embodiment of the invention also provides a kind of communicator of supporting low-rate user terminal, and particularly, this device can be meant base station equipment, also can be meant the functional entity that is positioned at inside of base station, can pass through software, hardware or way of hardware and software combination and realize.
See also Fig. 2, this device comprises:
Listening period allocation units 201 are used to the different listening period of pre-assigned each user's set of dispense, and described user's group comprises at least one user terminal;
Resource assignation unit 202 is used to the user terminal that is in current monitoring period to distribute interface-free resources;
Data transmission unit 203 is used for carrying out transfer of data by described interface-free resources and the user terminal that the user who is in current monitoring period organizes.
Alternatively, said apparatus may further include, grouped element, be used for time sequencing, radio environment information, ability information of user terminal according to the user terminal connecting system, or/and the QoS of survice demand information of user terminal is divided into corresponding user's group with user terminal.
Alternatively, above-mentioned resource assignation unit 202 may further include:
The first resource assignation unit is used for sending assignment message to each user terminal and distributes interface-free resources; Or
The second resource assignation unit is used for sending assignment message respectively to each group and distributes interface-free resources;
Described assignment message is that the instant effective or lasting designated time is effective.
The embodiment of the invention can be applicable to adopt the mobile communication system of OFDMA technology, for example the follow-up evolution system of WiMAX, LTE FDD system, LTE TDD system and these systems.
To sum up, the embodiment of the invention is passed through a large number of users end packet, system resource is organized user terminal according to time-multiplexed mode packet allocation to each, thereby improve the utilization ratio of system resource, support provides service for more substantial user terminal number, reduces the processing load and the energy consumption of user terminal.Especially, by the mode of group assignment and/or lasting assignment, further conserve bandwidth resource.
One of ordinary skill in the art will appreciate that, the process of the method for realization the foregoing description can be finished by the relevant hardware of program command, described program can be stored in the read/write memory medium, and this program is carried out the corresponding step in the said method when carrying out.Described storage medium can be as ROM/RAM, magnetic disc, CD etc.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (9)

1. a communication means of supporting low-rate user terminal is characterized in that, comprising:
Be the different listening period of pre-assigned each user's set of dispense, described user's group comprises at least one user terminal;
For the user terminal in the user's group that is in current monitoring period distributes interface-free resources;
Carry out transfer of data by described interface-free resources and user terminal in the user group that is in current monitoring period.
2. method according to claim 1 is characterized in that, describedly comprises for the user terminal in the user group that is in current monitoring period distributes interface-free resources:
By assignment message is that the user terminal that is in the user group of current monitoring period distributes interface-free resources.
3. according to the described method of claim 1, it is characterized in that described method further comprises:
According to time sequencing, radio environment information, the ability information of user terminal of user terminal connecting system, or/and the QoS of survice demand information of user terminal is divided into corresponding user's group with user terminal.
4. according to the described method of claim 2, it is characterized in that described is that the user terminal that is in the user group of current monitoring period distributes interface-free resources to be specially by assignment message:
Each user terminal in the user's group that is in current monitoring period sends assignment message respectively and distributes interface-free resources; Perhaps, organize to the user who is in current monitoring period and to send the assignment message comprise group index and user terminal identification, be in each user terminal in user's group of current monitoring period and be defined as the interface-free resources of self distributing by group index and user terminal identification.
5. according to the described method of claim 4, it is characterized in that described assignment message is instant assignment message, described instant assignment message is only distributed to interface-free resources user terminal and is used once; Perhaps, described assignment message continuous and effective expires up to the distribution time or the Resources allocation of this assignment message agreement.
6. according to claim 4 or 5 described methods, it is characterized in that, also comprise:
When user terminal sends assignment message, indication removes this user terminal other user terminals outside and keeps state of activation or enter resting state; Or
When organizing transmission group assignment message to each user, the user terminal that indication removes in this user's group other user's groups outside keeps state of activation or enters resting state.
7. a communicator of supporting low-rate user terminal is characterized in that, comprising:
The listening period allocation units are used to the different listening period of pre-assigned each user's set of dispense, and described user's group comprises at least one user terminal;
The resource assignation unit is used to the user terminal in the user's group that is in current monitoring period to distribute interface-free resources;
Data transmission unit is used for carrying out transfer of data by described interface-free resources and the user terminal that the user who is in current monitoring period organizes.
8. according to the described device of claim 7, it is characterized in that, described communicator further comprises: grouped element, be used for time sequencing, radio environment information, ability information of user terminal according to the user terminal connecting system, or/and, the QoS of survice demand information of user terminal is divided into corresponding user's group with user terminal.
9. according to claim 7 or 8 described devices, it is characterized in that described resource assignation unit comprises:
The first resource assignation unit is used for sending assignment message distribution interface-free resources to each user terminal of the user's group that is in current monitoring period; Or
The second resource assignation unit is used for organizing the transmission assignment message to the user who is in current monitoring period and distributes interface-free resources;
Described assignment message is that the instant effective or lasting designated time is effective.
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