CN104684070B - A kind of method for the value for configuring timing advance group and/or time synchronization timer - Google Patents

Abstract

It is the method that timing advance group is configured from cell that the present invention, which is proposed in a kind of base station, it is from the method for the value of cell setup time synchro timer, a kind of method of value of the synchro timer of setup time in the user terminal and a kind of method for configuring timing advance group in the user terminal in a base station.

Description

A kind of method for the value for configuring timing advance group and/or time synchronization timer

The application is a kind of " configuration timing advance of the Application No. 201110296358.X proposed on the 30th of September in 2011 The divisional application of the method for group and/or the value of time synchronization timer ".

Technical field

The present invention relates to the wireless communication based on carrier aggregation technology more particularly to configuration timing advance group and/or times The method of the value of synchro timer.

Background technology

At present, the concept of timing advance (Time Advance, TA) group (TA group) has been acceptable for supporting R11 In more TA values.By TA groups, cell (including main plot (Pcell) and from cell (Scell)) quilt of identical TA values is shared Divide in same TA groups, and do not share identical TA values Scell from Pcell and be in the TA groups different with Pcell.This Outside, the Scell with identical TA values will be in same TA groups.With introduce TA groups, it is necessary to by TA groups identify (TAG ID) identifies each TA groups.Therefore, it is necessary to solve wherein to identify TA marks and time synchronization for TA groups The value of timer (time Alignment Timer, TAT) will when and where sent.

In some motions, it has been proposed that TAG ID (for example, when Scell is injected towards UE) are sent when Scell is configured, Or during MAC is activated.In mostly configuration scene, any one of above two scheme can work normally, Because base station can be by running and safeguarding that it is special that (OAM, Operation and maintenance) order obtains network deployment Property.There are in the case of repeater (particularly ad-hoc repeaters), above-mentioned scheme may need subsequent RRC (Radio Resource Control, wireless spread-spectrum technology) connection reconfiguration is put or MAC activation, to redistribute TA groups, because base station can Can reconfigure for the first time or MAC activate when unallocated correct TA groups because base station was not aware that the position of UE at that time, That is, in the repeaters whether base station do not know UE.

For example, it is desired to study following two scenes：

Scene 1：UE is assumed within the coverage of repeater in base station, and new TA groups are distributed for the Scell

Scene 2：UE is assumed not within the coverage of repeater in base station, and existing TA groups are distributed in base station for Scell.

For scene 1, if UE, not within the coverage of repeater, base station may need the Scell for the UE Again existing TA groups, so as to need subsequent RRC MAC signalings.

For scene 2, if within the coverage of repeater, UE input relay stations are being detected by base station by UE After within coverage, base station just knows which is redistributed is existing after receiving and carrying out the pilot tone of user terminal TA groups.

For when/where send or discharge only comprising Scell TA groups TAT values the problem of, up to the present There are no any motions.But version 10 (Rel-10) is based on, when TA groups include Pcell, when Pcell is established (that is, RRC connections foundation either re-establish during) or Pcell change when, will send TAT values.

The content of the invention

According to the first aspect of the invention, it is the method that timing advance group is configured from cell in a base station to provide a kind of, This method comprises the following steps：II 1. is triggered at this from the random access procedure of the user terminal in cell；II2. according to the use Family terminal is at this from random access procedure in cell as a result, obtaining the user's terminal at this from the timing advance in cell Value；II3. according to the timing advance value, determine this from the final timing advance group belonging to cell.

According to the second aspect of the invention, it is the method that timing advance group is configured from cell in a base station to provide a kind of, This method comprises the following steps：- judge whether the timing advance value is effective to main plot and from cell；If the timing advance Value should belong to the slave cell of activation to main plot failure and effective from cell to this from cell, then established for this from cell new Timing advance group.

According to the third aspect of the invention we, it is from the value of cell setup time synchro timer in a base station to provide a kind of Method, this method includes any one of the following：- value of time synchronization timer is sent to user with RRC information Terminal；- by the value of time synchronization timer be included in physical accidental access procedure in be sent to user terminal；- by time synchronization The value of timer is included in media access control layer control signaling and is sent to user terminal.

According to the fourth aspect of the invention, a kind of side of the value of the synchro timer of setup time in the user terminal is provided Method comprises the following steps：The value of the new time synchronization timer of-reception from base station；- it is judged whether or not being currently running Time synchronization timer；If-currently by the time synchronization timer being currently running, stop the time being currently running Synchro timer, and run new time synchronization timer；Or wait the time synchronization timer operation being currently running After termination, the time synchronization timer that reruns new.

According to the fifth aspect of the invention, a kind of method for configuring timing advance group in the user terminal is provided, including Following steps：The new timing advance group mark of-reception from base station；- judge the timing advance group that user terminal is currently located Mark identify whether unanimously with the new timing advance group；- replaced if it is inconsistent, being identified with the new timing advance group The timing advance group mark being currently located.

Scheme using the present invention, it is preferable that subsequent RRC connection reconfigurations can be saved and put, so as to save signaling consumption, And quickly corresponding timing advance group can be configured for Scell.

Description of the drawings

The following detailed description to non-limiting example, other spies of the invention are read by referring to accompanying drawing Sign, the device block diagram of a specific embodiment according to the present invention.

Fig. 1 shows the method flow diagram of a specific embodiment according to the present invention.

Wherein, the same or similar reference numeral represents the same or similar steps characteristic or device/module.Purpose and excellent Point will become more apparent upon.

Specific embodiment

Hereinafter, brief description is carried out to " timing advance value " that is used in the present invention.

User terminal receiver by random access procedure for the first time with after downlink transmission synchronous of the reception from base station, being set Determine initial timing advance value.This needs user terminal to transmit a random access leader sequence so that thus base station can be estimated Go out the uplink transmission time of needs, also, base station responds the initial of 11 bits in random access response (RAR) message and determines When advance command.

, it is necessary to be continuously updated to offset uplink signal arrival after timing advance is set for each user terminal for the first time The time change of base station.The timing advance renewal process for eliminating these influences is realized by a closed loop mechanism, wherein, base It stands and measures the uplink received and send timing advance more newer command, determined with indicating user terminal compared with transmission before When adjusts its new transmission timing, and (only asynchronous user terminal goes to set theirs compared with the downlink timing received before Transmission time；All follow-up adjustment are made both relative to newest upper places transmission time).

In order to solve the problems, such as subsequent RRC information or MAC CE expenses that above-mentioned TA groups redistribute and bring, It proposes and problem is redistributed to TA groups during PRACH by allowing base station.

TA groups are distributed

Consider the distribution of TA groups, there are at least following two scenes：

Scene 1：Base station knows clearly the configuration of network, it is also known that the position of user terminal, therefore, base station can be direct TA groups are distributed for each Scell.

Scene 2：Base station does not either know network configuration or does not know the specific location of user terminal, and therefore, base station is not The target TA groups of Scell can be drawn exactly.

For scene 1, base station can determine the TA groups belonging to the Scell for each Scell exactly；However, for field Scape 2, base station can not directly predict the TA groups belonging to each Scell.Estimate that a kind of mode of the TA groups of Scell is in base station Based on PRACH processes, following two steps may be employed and realize：

Step S1, PRACH process of the base station triggers on Scell, and obtain the TA values for ensuring uplink；

The TA values of the acquisition and each TA values to prestore on base station are compared in step S2, base station.

If the TA values of the acquisition are close with the TA values of some existing TA group namely the difference of the two is in preset range Interior, then base station knows that corresponding Scell belongs to existing TA groups；Or

If the base station find that the difference between the TA values and the TA values of any one existing TA group that obtain is all higher than predetermined model It encloses, then base station knows that Scell should belong to a new TA group.So as to which base station can be the Scell newly one TA group of distribution.

No matter for base station known network configuration and user terminal position scene 1 or for base station unknown network The scene 2 of the position of configuration and/or user terminal, can be included into following three kinds of situations：

Situation one：

In SCell configurations or MAC (medium education, Media Access Control) orders：Using following Two TA group ID configuration steps：

A) step 1：Initial TA groups ID in RRC information be designated, the RRC information for configure the new Scell or The person initial TA groups ID is designated in first MAC PDU transmitted by the Scell new for this.

B) step 2：If initial TA groups ID incorrect (being detected via base station), triggers following steps：

I. PRACH processes are carried out on Scell, base station is existing with other by comparing the required TA values of the Scell The TA values of TA groups can correspondingly estimate final TA groups ID.

Ii. if desired, base station includes final TA groups ID in downstream message (DL message)

Divide following two situation discussion：

1. for based on non-competing wireless access process (contention-free radio access Procedure, CRFA), final TA groups ID is included in random access response (Random Access Response, RAR) In message.

2. for wireless access process competition-based (contention-based radio access procedure, CBRA), final TA groups ID is included in message 4.

Situation two：

It is reconfigured in TA groups：

A) PRACH of the base station triggers on Scell, and determine the instruction of target TA groups

B) when using CFRA modes, base station is respectively in message 2 (that is, accidental access response message, Random Access Response, RAR) on carry target timing and shift to an earlier date (Timing Advancement, TA) group mark or when adopting During with CBRA modes, base station carries target timing in message 4 and organizes mark in advance.

Said circumstances one and situation two can be summarized as following two steps：

Step 1：Base station distributes initial TA groups as the Scell newly configured using RRC information；

Step 2：New TA groups are distributed in base station for TA groups again, and are sent to user terminal, for example, in PRACH processes In.

Hereinafter, necessity and the effect of above-mentioned steps one and step 2 are discussed for scene 1 and scene 2 respectively.

For scene 1, step 1 is enough.Because base station is apparent which the Scell newly configured belongs to TA groups.

And for scene 2, in step 1, base station can be that the Scell distributes a new TA group, to ensure the user's end The correct uplink at end.Then, in step 2, the TA values of the newly assigned TA values and existing TA groups are compared in base station, To determine whether that existing TA groups have the uplink similar to the new Scell.If not provided, this is known in base station Scell belongs to new TA groups, and therefore, previously the TA groups for Scell distribution were correct.If so, then base station knows that this is new Scell belong to the TA groups with similar uplink, that is, the TA values of the TA values of the TA groups and the newly assigned TA groups Difference within a predetermined range.The preset range is related to concrete implementation problem, related with the manufacturing parameter of each manufacturer, does not relate to And the primary object of the present invention, therefore, it will not be described here.Therefore, base station identifies the existing TA groups in PRACH processes User terminal is indicated to when middle.For example, for CFRA, base station can identify the TA groups in insertion RAR message.But for CBRA, base station need TA groups mark being included in message 4.Because in random access scheme competition-based, base station only has When sending message 4, it just can determine which user terminal has carried out random access procedure.

Based on above discussion, it can be seen that step 1 is favourable for scene one, because for this scene, It carries out TA component timings and PRACH is not required.Step 1 for scene two it is not mandatory that, because it is base that correctly TA groups, which identify, It is determined in the PRACH processes in step 2.But step 1 is also advantageous even for scene two, because, in scene In two, by step 1, avoid the new state for occurring Scell in this scene namely Scell is configured not divide still With any TA groups.

Situation three：

Hereinafter, in situation three, consider that TA groups change

For the situation that TA groups change, if base station detects that the current uplink of a Scell is no longer valid, example Such as, base station does not receive any transmitting uplink data on the Scell in predetermined time period, then base station will be considered to this Scell should not continue to belong to current TA groups.Therefore, base station or the Scell is deleted, and increased on the same frequency band new Scell, then carry out the above-mentioned PRACH processes distributed for TA groups.

Alternatively, base station can directly trigger the PRACH processes on the Scell, to obtain required TA values, then again really Fixed correct TA groups.

For above two situation, final TA groups mark is sent to user terminal also by PRACH processes, for example, right It in CFRA, sends in RAR, for CBRA, is sent in message 4.When TA groups, which are identified, to be provided with RAR or message 4, user Terminal knows that the TA groups mark for the Scell for carrying out PRACH is changed.Alternatively, if base station can be learnt without doubt The target TA groups of Scell, then base station can be using RRC information for the volume TA group mark new to corresponding Scell configurations.

Particularly, due to already agreeing upon, Pcell groups will not change, accordingly, it is possible to such situation 3A occur.

Three A of situation：

Pcell groups change

After base station detects that TA values have failed for Pcell, for example, situation of the base station according to uplink, for example, Base station does not receive any transmitting uplink data on the Scell in predetermined time period, but for where the Pcell Pcell groups in, do not detect that the TA values have failed to other Scell activated, that is, the TA values are in the Pcell groups Scell it is still effective, that is, base station do not detect in Pcell groups activation Scell time drift.

For Pcell, base station should trigger the PRACH on Pcell, to obtain new TA values, to ensure the fortune of Pcell Row.

According to current conclusion, protecting the ID of the TA group of Pcell cannot change, and since base station is not detected The time migration of the Scell of activation and to trigger the new TA values obtained after new PRACH processes for Pcell sharp for these Scell living is invalid.Then base station by these activate and the original still effective Scell of TA values be put into new timing and carry In preceding group, including the new TA groups mark of all Scell (that is, activate and TA values are still effective) distribution into the new TA groups Know.TA values originally can be still continuing with by these Scell in the new TA groups.Alternatively it is also possible to it is the new TA All Scell in group initiate new PRACH processes respectively, certainly, should be by PRACH processes institute to obtain corresponding TA values The TA values of acquisition are likely to identical with the TA values before being somebody's turn to do.

Although above embodiment merely depicts the Scell of processing to(for) activation, the present invention is equally applicable original Pcell groups in all Scell.

TAT values for the TA groups for only including Scell

For R11, each independent TAT is run for each TA groups, and each TA groups can be configured different TAT Value.Therefore, how it is that each TA groups configure TAT values that the problem of one important if being, Second Problem is how to reconfigure TA groups TAT values.

According to the TAT operating principles of R10, after user terminal receives TA TAC, TAT should be opened or again It opens.This means before user terminal obtains TA, TAT values should be configured in advance.Otherwise, the principle of R10 just can not be by It abides by.In view of the concept of TA groups, provided for when to the TA groups for only including Scell or discharge TAT values, it should followed following Principle：

Principle 1：When distributing first Scell if a TA group, the value of the TAT should be configured.

Principle 2：Reconfiguring for TAT is supported in R11.If Scell is added into an existing TA group, Just whether TAT values can be not required to be configured (of course, it is possible to provide the change to TAT values, and without considering time synchronization timer It is running)；When user terminal receive the TAT values of TA groups or belong to TA groups Scell TAT values, and the TA groups are configured TAT values, then the new TAT values will replace existing TAT values.

Principle 3：If the last one Scell in a group is released, user terminal and base station all discharge TAT and match somebody with somebody It puts, either dominant signaling, and can be recessive.Wherein, explicit signaling represents signaling under base station, and then user is whole End is according to the release TAT configurations of the signaling from base station received；Recessive denoting signaling user terminal automatically discharges.

For wherein sending the TAT values of the only TA groups comprising Scell, there are following two selections：

A) RRC information for configuring Scell/TA groups is utilized

I. TAT value informations element (Information Element, IE) is designed for configuring Scell/TA groups In RRC information

Ii.TAT values are to force configuration for the Scell configured in TA groups by first

Iii. if TAT values IE is used to configure first Scell being configured in non-TA groups, but for configuring other Scell, then substitute the current TAT values of all Scell in the TA groups with the new TAT values

Iv. after TA values corresponding with TA groups are obtained, TAT begins to start.

B) TAT values are comprised in the PRACH processes of TA groups

I. RAR message or message 4 are utilized respectively to CFRA and CBRA

Ii. if TAT values are comprised in the RAR message of the PRACH processes on Scell or message 4, and the Scell It is not first Scell of TA groups, then the TAT values before the Scell are substituted by the new TAT values.

C) activated by MAC CE, such as MAC

For the design, new MAC CE are designed to distribute TAT values for corresponding TA groups.Therefore, new LCID (is patrolled Collect channel logo, Logic Channel ID) it needs for identifying MAC CE, for the purpose of TAT distribution.The new MAC CE is it must be appreciated that ground mark TAT values and corresponding TA groups.

The processing of the value of TAT is received when d) being currently running for time synchronization timer (TAT) again

If the time synchronization timer (TAT) of TA groups is currently running, another TAT value for being related to the TA groups is whole by user Termination receives, then user terminal restarts current TAT based on the new TAT values.It is of course also possible to when TAT is due to other Factor, such as receive TA orders (TAC), and when being reset, reuse the new TAT values.

The embodiment of the present invention is described above, but the invention is not limited in specific system, equipment and Specific agreement, those skilled in that art can make various deformations or amendments within the scope of the appended claims.

The those skilled in the art of those the art can be by studying specification, disclosure and attached drawing and appended Claims, understand and implement other changes to the embodiment of disclosure.In the claims, word " comprising " is not arranged Except other elements and step, and wording "one" be not excluded for plural number.In the present invention, " first ", " second " only represent name Claim, do not represent orbution.In the practical application of invention, cited multiple skills in the possible perform claim requirement of a part The function of art feature.Any reference numeral in claim should not be construed as the limitation to scope.

Claims (5)

1. It is 1. a kind of in a base station for only comprising the value from the slave cell setup time synchro timer in the timing advance group of cell Method, this method includes：

   The value of the time synchronization timer is sent to by user terminal by any one of the following：

   - value of the time synchronization timer is sent to user terminal with wireless spread-spectrum technology message；

   - by the value of the time synchronization timer be included in physical accidental access procedure in be sent to user terminal；

   - by the value of the time synchronization timer be included in media access control layer control signaling in be sent to user terminal,

   This method further includes：

   - all whether being released from cell of judging in the timing advance group；

   If-it is all be released from cell, release time synchro timer configuration.
2. 2. according to the method described in claim 1, wherein, this method further includes：

   - judge this from cell whether for timing advance group configure if being the base station first from cell；

   If-should be the base station from cell for first of the configuration of timing advance group from cell, it is same from cell setup time for this Walk the value of timer.
3. 3. according to the method described in claim 1, wherein, the method further includes：

   - to user terminal transmission be used to indicate release time synchro timer configuration instruction.
4. 4. according to the method described in claim 1, when using sending time synchronization timing in media access control layer control signaling During the value of device, the method further includes：

   Using Logic Channel Identifier identification for the media access control layer control element of distribution time synchro timer.
5. 5. a kind of is only to include from the slave cell setup time synchro timer in the timing advance group of cell in the user terminal Value method, comprise the following steps：

   The value of the new time synchronization timer of-reception from base station；

   - it is judged whether or not the time synchronization timer being currently running；

   If-currently by the time synchronization timer being currently running, stop the time synchronization timer being currently running, and Run new time synchronization timer；Or it after waiting the time synchronization timer operation termination being currently running, reruns New time synchronization timer,

   Wherein, this method further includes：

   - all whether being released from cell of judging in the timing advance group；

   If-it is all be released from cell, release time synchro timer configuration.