CN101478792B - Dedicated random access resource preservation method and base station - Google Patents
Dedicated random access resource preservation method and base station Download PDFInfo
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Abstract
The invention provides a method of specialized random access resource reservation. In the method, the required time of the terminal random access failure is estimated, and according to the required time of the terminal random access failure, the reserved period of specialized random access resources is determined; when the random access process is triggered, the base station distributes specialized random access resources for the terminal according to the reserved period. The invention simultaneously provides a base station for realizing the specialized random access resource reservation, and the method and the base station can avoid unnecessary specialized random access resource reservation and improves the utilization rate of the specialized random access resources.
Description
Technical field
The present invention relates to the access technology at random in the mobile communication system, relate in particular to a kind of dedicated random access resource preservation method and base station.
Background technology
In mobile communication system, carry out transmitting uplink data and need satisfy a kind of distinctive transmission conditions, promptly uplink synchronous its objective is that the upward signal that makes from different distance, different terminals arrives base station or relaying synchronously.Uplink synchronous can be brought a lot of benefits for system, for example, reduces the interference of signal between adjacent time-slots, improves systematic function, simplifies the design of base station/link receiver etc.Therefore, the terminal that is in asynchronous regime needs afterwards, to carry out transmitting uplink data under the mode of uplink synchronous by the uplink synchronous of random access procedure foundation with network before carrying out transmitting uplink data.Described random access procedure comprises random access procedure and the two kinds of situations of the random access procedure in the cell switch process when terminal and network connect.
According to the up-to-date conclusion that 3GPP Long Term Evolution (LTE) is discussed, random access procedure has two kinds of forms, is respectively: based on the random access procedure of competition with based on uncompetitive random access procedure.In above-mentioned two kinds of random access procedures, be applicable to all access scenes at random based on the random access procedure of competing, as: initial random access; Terminal has upstream data to send; Network has downlink data to send; Terminal is in minizone switching etc.And only be applicable to that based on uncompetitive random access procedure network can predict the scene that terminal will insert at random, and as: network has downlink data to send; Terminal is in minizone switching etc.Compare random access procedure, have collisionless, advantages such as access delay weak point based on uncompetitive random access procedure based on competition.So under possible situation, general use as far as possible is based on uncompetitive random access procedure.
Below, to being described in detail, as shown in Figure 1, comprise based on the step of uncompetitive random access procedure based on uncompetitive random access procedure:
Step 101: the base station is the terminal distribution random access resource, described random access resource is specially: random access leader sequence (Random Access Preamble) and Random Access Channel (RACH, RandomAccess Channel) time-the frequency Resource Block, wherein, random access leader sequence abbreviates Preamble hereinafter as.The base station guarantee the Preamble that distributed when the RACH that is distributed-can not used on the frequency Resource Block by other-end.
Step 102: the base station generates the allocation result indication information according to the allocation result of random access resource, sends to relevant terminal.
Wherein, comprise in the allocation result indication information: be the sign of the Preamble of terminal distribution; During the RACH that reserves for terminal-frequency hopping pattern of frequency Resource Block; During the RACH that reserves for terminal-out-of-service time of frequency Resource Block.
Step 103: after terminal receives described allocation result indication information, according to the relevant information in the allocation result indication information, when being the RACH of its distribution in the base station-send corresponding Preamble on the frequency Resource Block.
Step 104: accidental access response message is returned in the base station after receiving Preamble, comprise in the response message: terminal sends regularly adjustment amount.
Step 105: after terminal received described accidental access response message, the adjustment amount adjustment sent regularly according to sending regularly, sets up uplink synchronous, and afterwards, random access procedure finishes.
For based on uncompetitive random access procedure, under a lot of application scenarioss, the reservation of dedicated random access resource need be carried out in the base station, and it is inferior for example to carry out the scene switched the minizone in terminal.Below, will be described in detail based on the dedicated random access resource preservation method in the uncompetitive random access procedure under the handoff scenario of sub-district.
The so-called switching, be meant that working as terminal moves to another base station overlay area from a base station overlay area in communication process, when perhaps causing communication quality to descend, must transfer to the process of the idle communication link of other sub-districts from current communication link owing to external interference.Before the switching, being the cell-of-origin for terminal provides the sub-district of service, is source base station for terminal provides serving base station; After the switching, being Target cell for terminal provides the sub-district of service, is target BS for terminal provides serving base station.At Target cell, for can transceive data, terminal needs to use earlier random access procedure to set up uplink synchronous with Target cell.The conclusion present according to LTE, this random access procedure can adopt based on uncompetitive random access procedure.
According to the step 101 shown in Fig. 1, when beginning based on uncompetitive random access procedure, terminal is positioned at the cell-of-origin, and target BS is the terminal distribution dedicated random access resource according to the dedicated random access resource preservation cycle of setting, in the prior art, described reservation period is generally 5ms; Afterwards, target BS generates allocation result indication information notification source base station according to being the dedicated random access resource of terminal distribution, and sends to terminal by source base station.Described dedicated random access resource is meant: in the random access procedure, be the random access resource that particular terminal is reserved, when comprising-Resource Block and code word etc. frequently.Comprise in the described allocation result indication information: be the sign of the Preamble of terminal distribution; During the RACH that reserves for terminal-frequency hopping pattern of frequency Resource Block; During the RACH that reserves for terminal-out-of-service time of frequency Resource Block.
Wherein, consider the time delay in the switching command message process of transmitting, target BS be terminal reserve RACH the time-the frequency Resource Block is not one usually, and is but a plurality of.
With the frame structure under the TDD mode shown in Figure 2 (TDD) is example; comprise 8 subframe subframe# 0, subframe# 2～subframe# 5 and subframe# 7～subframe# 9 in each frame; and every 5ms comprises three special time slots, is respectively: descending pilot frequency time slot (DwPTS), protection time slot (GP) and uplink pilot time slot (UpPTS).Wherein, the UpPTS time slot can be arranged to RACH.Supposing the system has all disposed RACH at all UpPTS time slots.If target BS were a terminal when having reserved two RACH-the frequency Resource Block, lay respectively in the subframe Subframe#1 and subframe Subframe#6 among Fig. 2, then target BS need be with the out-of-service time of reserved resource, and promptly subframe Subframe#6 time corresponding sends to terminal.When terminal received switching command, if the described out-of-service time does not also arrive, then terminal can be used based on uncompetitive random access procedure and insert Target cell; Otherwise, need to use random access procedure to insert Target cell based on competition.
In the prior art, above-mentioned dedicated random access resource preservation scheme is based on that the short period reserves continuously, for example in the example of being lifted among Fig. 2, be to be the cycle with 5ms, reserve continuously, do not consider the Preamble retransmission interval of terminal, have the wasting of resources.Be example still below, make a concrete analysis of with the 5ms reservation period:
In based on uncompetitive random access procedure, after terminal was sending Preamble, the base station need be detected and handle the described Preamble that receives, and establishing the elapsed time that detects and handle described Preamble in the base station is A;
After the detection and processing end of base station to described Preamble, network sends to terminal with accidental access response message in a time window, and the window duration of establishing described time window is B;
Terminal need be decoded to described accidental access response message after receiving described accidental access response message, and establishing terminal is C to the decode time of accidental access response message;
If after accidental access response message is decoded, terminal is found self not responded, then on dedicated random access resource subsequently, insert at random again, promptly, after terminal sends Preamble, need to wait for after the time of A+B+C, could confirm that network does not respond the Preamble that self sent, and restart random access procedure next time, therefore, be longer than in the time of A+B+C under the situation of 5ms, if terminal has used the dedicated random access resource that is arranged in Fig. 2 subframe Subframe#1 to insert at random, then can not use the dedicated random access resource that is positioned at subframe Subframe#6, that is to say, may cause the waste of resource based on continuous dedicated random access resource preservation mode of short period.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of dedicated random access resource preservation method and base station, can avoid the reservation of unnecessary dedicated random access resource, improves the utilization ratio of dedicated random access resource.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of dedicated random access resource preservation method, this method comprises:
Estimation terminal access failure required time at random, and, determine the reservation period of dedicated random access resource according to the described terminal that estimates access failure required time at random;
After random access procedure triggered, the base station was the terminal distribution dedicated random access resource according to described reservation period.
Wherein, described estimation terminal access failure required time at random is specially: estimate respectively in the random access procedure, the base station to random access leader sequence Preamble detect and handle the required processing time, the base station sends to the window duration of the employed time window of terminal and the decode time that the decoding terminals accidental access response message is consumed with accidental access response message, above-mentioned three temporal summations that will estimate afterwards obtain described terminal access failure required time at random.
The reservation period of described definite dedicated random access resource is: each base station is determined the dedicated random access resource preservation cycle of self correspondence respectively;
Accordingly, the reservation period of the dedicated random access resource of base station correspondence is more than or equal to base station relevant terminal access failure required time at random.
The reservation period of described definite dedicated random access resource is: for determining the reservation period of unified dedicated random access resource in each base station in the whole network;
Accordingly, the reservation period of described unified dedicated random access resource is more than or equal to the maximum in the access failure required time at random of all base station relevant terminal in the network.
Determine that after the described reservation period, this method further comprises: the described unified dedicated random access resource preservation cycle that will determine is set at the standard value in the dedicated random access resource preservation cycle of each base station correspondence.
After the base station was the terminal distribution dedicated random access resource, this method further comprised: the base station generates the allocation result indication information and sends to terminal according to being the dedicated random access resource of terminal distribution.
When the base station was the terminal distribution dedicated random access resource according to dedicated random access resource preservation cycle of self correspondence, described allocation result indication information comprised at least:
Sign for the Preamble of terminal distribution;
During the Random Access Channel RACH that reserves for terminal-frequency hopping pattern of frequency Resource Block;
During the RACH that reserves for terminal-time interval of frequency Resource Block;
During the RACH that reserves for terminal-relative position of frequency Resource Block is offset; And,
During the RACH that reserves for terminal-out-of-service time of frequency Resource Block.
When the base station was the terminal distribution dedicated random access resource according to described unified dedicated random access resource preservation cycle of standard, described allocation result indication information comprised at least:
Sign for the Preamble of terminal distribution;
During the RACH that reserves for terminal-frequency hopping pattern of frequency Resource Block;
During the RACH that reserves for terminal-relative position of frequency Resource Block is offset; And,
During the RACH that reserves for terminal-out-of-service time of frequency Resource Block.
The present invention provides a kind of base station of realizing dedicated random access resource preservation simultaneously, and this base station comprises reservation period determination module and resource distribution module, wherein,
The reservation period determination module, be used for determining under self base station relevant terminal access failure required time at random, and determine the dedicated random access resource preservation cycle according to the described time, the relevant information of the described reservation period determined is sent to resource distribution module;
Resource distribution module is used for after receiving described relevant information, after random access procedure triggers, is that relevant terminal is distributed dedicated random access resource according to described reservation period.
Wherein, resource distribution module is further used for: the allocation result according to dedicated random access resource generates the allocation result indication information, and described allocation result indication information is sent to data transmission blocks;
Accordingly, this base station further comprises:
Data transmission blocks, the described allocation result indication information that is used for receiving sends to relevant terminal.
Dedicated random access resource preservation method provided by the present invention and base station, take all factors into consideration in the random access procedure, the base station is detected and is handled the required processing time Preamble, the base station sends to accidental access response message the window duration of the employed time window of terminal, and the decode time that consumed of decoding terminals accidental access response message, and according to obtaining terminal access failure required time at random behind above-mentioned three temporal summations, according to described terminal access failure required time at random, determine the dedicated random access resource preservation cycle of each base station correspondence, perhaps unified dedicated random access resource preservation cycle of each base station in the network, the base station is according to the described reservation period of self correspondence, perhaps described public reservation period is the terminal distribution dedicated random access resource, avoid the reservation of unnecessary dedicated random access resource, improved the utilization ratio of dedicated random access resource.
Description of drawings
Fig. 1 is that prior art is based on uncompetitive random access procedure schematic diagram;
Fig. 2 is a prior art tdd frame structural representation;
Fig. 3 is the method flow schematic diagram of dedicated random access resource preservation of the present invention;
Fig. 4 realizes the architecture of base station schematic diagram of dedicated random access resource preservation for the present invention.
Embodiment
Basic thought of the present invention is: determine terminal access failure required time at random, and according to the determined time, be set the suitable dedicated random access resource preservation cycle, being used for the base station is the terminal distribution dedicated random access resource at random access procedure.
Describe the method for dedicated random access resource preservation of the present invention and the realization of base station in detail below in conjunction with accompanying drawing.
Fig. 3 is the method flow schematic diagram of dedicated random access resource preservation of the present invention, and as shown in Figure 3, this method comprises:
Step 301: the pairing terminal of base station estimation self is the access failure required time at random.
Wherein, terminal at random the access failure required time be: terminal begins random access procedure until confirm the needed concrete time value of access failure at random.The described terminal estimation of access failure required time at random specifically need be considered to comprise time of three aspects:
In based on uncompetitive random access procedure, after the base station sends to terminal with the allocation result indication information,
(1) terminal is after sending Preamble, and the time of required consumption is detected and handle in the base station to Preamble, and establishing the base station, Preamble to be detected and handles the needed processing time be A.Wherein, the value of processing time A is relevant with the disposal ability of base station, and the value of each corresponding processing time A in base station may be different.Wherein, how the base station estimates that specifically the value of described processing time A belongs to known technology, repeats no more here.
(2) after the described processing end of base station to Preamble, network sends to terminal with accidental access response message in a time window, and the window duration of establishing described time window is B; Wherein, the value of window duration B can be set up on their own by load and the disposal ability of each base station according to self.Concrete value how to set described window duration B belongs to known technology, repeats no more here.
(3) after terminal receives the accidental access response message that returns the base station, need to decode to described accidental access response message, establishing the decode time that the decoding terminals accidental access response message consumed is C.Wherein, the value of decode time C is by the disposal ability decision of terminal, the base station can obtain the value of decode time C according to the minimum disposal ability of terminal, and promptly the C value of keeping of preferably going bail for also can be finished the decoding of accidental access response message to guarantee low-grade terminal in described decode time C.
By the estimation of above-mentioned processing time A, window duration B, decode time C value, A, B, the summation of C value are obtained the pairing terminal in base station access failure required time D=A+B+C at random.Wherein, described summation process, the base station uses correlation technique of the prior art to finish, and repeats no more here.
Generally speaking, when the base station start, when the value of perhaps above-mentioned window duration B changes, this step and follow-up step 302 will be triggered.
In addition, described estimation terminal access failure required time at random not only can be estimated by the base station, also can be estimated by the mobile communication service provider of setting up the base station or core net etc.
Step 302: determine dedicated random access resource preservation cycle E, the described dedicated random access resource preservation cycle is: the time interval that base station assigns is given same terminal between adjacent when inserting at random-frequency Resource Block.Wherein, the E value is got the value that is not less than the D value.And, described E value is associated at interval with the RACH channel time slot of base station institute transmit frame, preferably value is the minimum value in the integral multiple at RACH channel time slot interval and the value that is not less than the D value, for example, if RACH channel time slot is spaced apart 5ms, the D value is 7ms, and slot length is 1ms, and then the best value of E value is 10ms.
Wherein, describedly determine to be the value of determining self pairing described reservation period E by each base station respectively according to the situation of self; Also each D value that can estimate according to all base stations in the communication network of being set up, determine the value of the unified dedicated random access resource preservation cycle E of all base station correspondences in the network, described definite unified dedicated random access resource preservation cycle can be finished by core net, at this moment, the standard value of described reservation period E value as each base station dedicated random access resource preservation cycle in the communication network can be added in the base station design standard.The value of described unified reservation period E need be not less than the maximum in the D value that all base stations estimated in the network, and is RACH channel time slot integral multiple at interval.
Wherein, the base station is specifically how according to self relevant terminal described reservation period E value of definite self correspondence of access failure required time D value at random, and how core net to determine that described unified reservation period all can use correlation technique of the prior art to finish, and repeats no more here.
Step 303: after random access procedure triggered, the base station was the terminal distribution dedicated random access resource according to described dedicated random access resource preservation cycle E.
Wherein, the base station specifically how according to described reservation period for the terminal distribution dedicated random access resource belongs to known technology, repeat no more here.
Step 304: the base station generates the allocation result indication information and sends to terminal according to the allocation result of dedicated random access resource.
At least comprise in the described allocation result indication information:
Sign for the Preamble of terminal distribution;
During the RACH that reserves for terminal-frequency hopping pattern of frequency Resource Block;
During the RACH that reserves for terminal-time interval of frequency Resource Block; Wherein, the described time interval is reservation period E, and the value of reservation period E is the standard value that is set to each base station in the step 302, then in this step, need not to add the information of described reservation period E value in the allocation result indication information;
During the RACH that reserves for terminal-relative position of frequency Resource Block is offset; Wherein, be that 10ms is an example with prepared separation E, the private resource that the base station needs to be designated as its reservation to terminal is positioned at odd number field or even number half-frames;
During the RACH that reserves for terminal-out-of-service time of frequency Resource Block.
Wherein, how the base station specifically generates described allocation result Indication message can be used prior art, difference only is in described allocation result Indication message to increase the relevant information of the time interval of frequency Resource Block " during for the RACH of terminal reservation-", repeats no more here.
Step 305: terminal uses dedicated random access resource to begin random access procedure according to the described allocation result indication information of the base station that receives.Wherein, described random access procedure can be for based on uncompetitive random access procedure.In addition, how terminal uses described resource to begin random access procedure belongs to known technology, repeats no more here.
Wherein, step 304 and 305 is an optional step.
Fig. 4 realizes the architecture of base station schematic diagram of dedicated random access resource preservation for the present invention, and as shown in Figure 4, this base station comprises: reservation period determination module 410, resource distribution module 420 and data transmission blocks 430, wherein,
Reservation period determination module 410, be used for determining the pairing terminal in the base station access failure required time at random under self, and according to described terminal at random the access failure required time determine the dedicated random access resource preservation cycle, the relevant information of the described reservation period determined is sent to resource distribution module 420.
Wherein, described relevant information comprises at least: the concrete value of determined described reservation period.
Data transmission blocks 430, the described allocation result indication information that is used for receiving sends to relevant terminal.
Wherein, data transmission blocks 430 is optional module.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1. a dedicated random access resource preservation method is characterized in that, this method comprises:
Estimation terminal access failure required time at random, and, determine the reservation period of dedicated random access resource according to the described terminal that estimates access failure required time at random;
After random access procedure triggered, the base station was the terminal distribution dedicated random access resource according to described reservation period.
2. dedicated random access resource preservation method according to claim 1, it is characterized in that, described estimation terminal access failure required time at random is specially: estimate respectively in the random access procedure, the required processing time is detected and handled in the base station to random access leader sequence Preamble, the base station sends to accidental access response message the window duration of the employed time window of terminal, and the decode time that consumed of decoding terminals accidental access response message, above-mentioned three temporal summations that will estimate afterwards obtain described terminal access failure required time at random.
3. dedicated random access resource preservation method according to claim 1 is characterized in that, the reservation period of described definite dedicated random access resource is: each base station is determined the dedicated random access resource preservation cycle of self correspondence respectively;
Accordingly, the reservation period of the dedicated random access resource of base station correspondence is more than or equal to base station relevant terminal access failure required time at random.
4. dedicated random access resource preservation method according to claim 1 is characterized in that, the reservation period of described definite dedicated random access resource is: for determining the reservation period of unified dedicated random access resource in each base station in the whole network;
Accordingly, the reservation period of described unified dedicated random access resource is more than or equal to the maximum in the access failure required time at random of all base station relevant terminal in the network.
5. dedicated random access resource preservation method according to claim 4 is characterized in that, determines that after the described reservation period, this method further comprises:
Be set at the standard value in the dedicated random access resource preservation cycle of each base station correspondence the described unified dedicated random access resource preservation cycle of determining.
6. according to each described dedicated random access resource preservation method of claim 3 to 5, it is characterized in that after the base station was the terminal distribution dedicated random access resource, this method further comprised:
The base station generates the allocation result indication information and sends to terminal according to being the dedicated random access resource of terminal distribution.
7. dedicated random access resource preservation method according to claim 6 is characterized in that, when the base station was the terminal distribution dedicated random access resource according to dedicated random access resource preservation cycle of self correspondence, described allocation result indication information comprised at least:
Sign for the Preamble of terminal distribution;
During the Random Access Channel RACH that reserves for terminal-frequency hopping pattern of frequency Resource Block;
During the RACH that reserves for terminal-time interval of frequency Resource Block;
During the RACH that reserves for terminal-relative position of frequency Resource Block is offset; And,
During the RACH that reserves for terminal-out-of-service time of frequency Resource Block.
8. dedicated random access resource preservation method according to claim 6, it is characterized in that, when the base station was the terminal distribution dedicated random access resource according to unified dedicated random access resource preservation cycle of standard, described allocation result indication information comprised at least:
Sign for the Preamble of terminal distribution;
During the RACH that reserves for terminal-frequency hopping pattern of frequency Resource Block;
During the RACH that reserves for terminal-relative position of frequency Resource Block is offset; And,
During the RACH that reserves for terminal-out-of-service time of frequency Resource Block.
9. a base station of realizing dedicated random access resource preservation is characterized in that, this base station comprises reservation period determination module and resource distribution module, wherein,
The reservation period determination module, be used for determining under self base station relevant terminal access failure required time at random, and determine the dedicated random access resource preservation cycle according to the described time, the relevant information of the described reservation period determined is sent to resource distribution module;
Resource distribution module is used for after receiving described relevant information, after random access procedure triggers, is that relevant terminal is distributed dedicated random access resource according to described reservation period.
10. the base station of realization dedicated random access resource preservation according to claim 9, it is characterized in that, resource distribution module is further used for: the allocation result according to dedicated random access resource generates the allocation result indication information, and described allocation result indication information is sent to data transmission blocks;
Accordingly, this base station further comprises:
Data transmission blocks, the described allocation result indication information that is used for receiving sends to relevant terminal.
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| CN101998488B (en) * | 2009-08-20 | 2014-12-10 | 中兴通讯股份有限公司 | Method and device for setting longest preserve time of special random access preamble |
| CN102083228B (en) | 2010-02-11 | 2015-05-20 | 电信科学技术研究院 | Random access method and equipment for relay system |
| WO2016011667A1 (en) * | 2014-07-25 | 2016-01-28 | 华为技术有限公司 | Method and device for transmitting random access preamble |
| CN106454995B (en) * | 2015-08-10 | 2021-06-04 | 上海诺基亚贝尔股份有限公司 | Method for configuring relay discovery message transmission resources, corresponding relay terminal device and remote terminal device |
| CN105357726B (en) * | 2015-12-11 | 2018-07-03 | 江苏鑫软图无线技术股份有限公司 | LTE fast switch over method based on downlink timing offset and target BS pre-authorization |
| WO2017166253A1 (en) * | 2016-03-31 | 2017-10-05 | 华为技术有限公司 | Method for sending random access preamble sequence, terminal device, access network device |
| CN106604406A (en) * | 2016-04-28 | 2017-04-26 | 福建先创通信有限公司 | Uplink channel reserving method in random access process |
| JP6592608B2 (en) * | 2016-08-12 | 2019-10-16 | 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． | Resource selection method, apparatus and device |
| CN107734565B (en) * | 2016-08-12 | 2023-11-17 | 中兴通讯股份有限公司 | System information processing method and device |
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