CN102158948A - Method for obtaining up time advance in carrier aggregation - Google Patents
Method for obtaining up time advance in carrier aggregation Download PDFInfo
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Abstract
The invention discloses a method for obtaining up time advance in carrier aggregation. A plurality of up CC are divided into a plurality of groups by eNB; the quantity of up CC in each group is at least one; grouping information and marks of groups of all the up CC are informed to UE; eNB configures different TA values for all the groups; each group of UE respectively obtains TA value corresponding to the group through a random access process; and each up CC group in the group takes the TA value corresponding to the group as a TA value corresponding to each up CC group. The method can ensure that one UE obtains a plurality of TA values.
Description
Technical field
The present invention relates to field of wireless communication, obtain the method for up Timing Advance in particularly a kind of carrier aggregation.
Background technology
In order to satisfy the demand of IMT-Advanced, 3GPP has carried out the research of LTE-Advanced project, the i.e. evolution system of LTE.The key technology of LTE-Advanced system comprises: many antennas strengthen (Enhanced MIMO) technology, carrier aggregation (Carrier Aggregation, CA) technology, relaying (Relaying technology) and multipoint cooperative transmission (Coordinated Multi-point, CoMP) technology etc.Wherein, carrier aggregation technology is to improve the direct method of message transmission rate, carrier aggregation be meant subscriber equipment (UE) data can a plurality of member carriers (Component Carrier, CC) on transmission simultaneously, be equivalent to increase user's transmission bandwidth.In LTE Rel-10, each CC should backward compatibility LTE Rel-8/9, and promptly the bandwidth of each CC all is bandwidth (for example, the 1.4MHz that defines among the LTE Rel-8/9,, 3MHz,, 5MHz,, 10MHz,, 15MHz, or 20MHz), and the UE of Rel-8/9 also can insert single CC.The CC that user of 3GPP regulation can use simultaneously mostly is most 5, and the maximum transmission bandwidth of unique user can reach 100MHz in theory like this, and this will greatly improve the peak rate of user data transmission.
According to the residing frequency range of uplink and downlink member carrier, carrier aggregation can be divided into intra-band carrier aggregation and inter-band carrier aggregation.The intra-band carrier aggregation is meant that a plurality of CC that condense together belong to same frequency range, and the inter-band carrier aggregation is meant that a plurality of CC that condense together are in different frequency ranges.In LTE Rel-10, for the FDD system, down direction is supported intra-band carrier aggregation and inter-band carrier aggregation, and the up intra-band carrier aggregation of only supporting.For the TDD system, descending and up direction is all only supported the intra-band carrier aggregation.
CC represents a up-link carrier or a descending carrier, and a up CC and a descending CC are associated by certain corresponding relation and have just constituted a sub-district (Cell), so carrier aggregation is also referred to as sub-district polymerization (Cell Aggregation).In order to support the asymmetry of uplink and downlink business, a sub-district also can have only descending CC and not have up CC.
For the ease of member carrier is managed, 3GPP introduced again main member carrier (Primary CC, PCC) and auxilliary member carrier (Secondary CC, notion SCC), and stipulate that each UE is up to a up PCC and a descending PCC.The effect of descending PCC comprise set up radio resource control (Radio Resource Control, RRC) signaling connect, Non-Access Stratum (Non-Access Stratum, NAS) mobility and as the input of security parameters etc.; Up PCC is used to send the control information of physical layer.Descending PCC and up PCC be associated constituted the main plot (Primary Cell, PCell), descending SCC and the up SCC that is associated constituted together auxilliary sub-district (Secondary Cell, SCell).
Fig. 1 is the schematic diagram of intra-band carrier aggregation, and Fig. 2 is the schematic diagram of inter-band carrier aggregation.Wherein, represent descending CC, represent up CC, with the descending PCC of slash shadow representation, with the up PCC of square shadow representation with arrow upwards with downward arrow.As shown in Figure 1, three descending CC belong to same frequency range: frequency range A, and two up CC belong to same frequency range: frequency range A.As shown in Figure 2, three descending CC belong to different frequency range: frequency range A and frequency range B, two up CC belong to same frequency range: frequency range A.
Fig. 3 is 5 kinds of scene schematic diagrames of carrier aggregation.As shown in Figure 3, carrier aggregation has 5 kinds of deployment scenario.Carrier aggregation with 2 CC (CC1 and CC2) is that example is introduced respectively various scenes below, and wherein, 2 CC can be up CC, can all be descending CC also, also can one be up CC, another is descending CC.In scene 1, CC1 belongs to identical base station (eNB) with CC2, and the coverage of CC1 and CC2 is basic identical; The typical case of scene 1 is the intra-band carrier aggregation.In scene 2, CC1 belongs to identical eNB with CC2, but the coverage of CC1 and CC2 is different; The coverage of CC1 is big, is used to provide covering, and the coverage of CC2 is little, is used for improving the capacity of eNB center coverage.In scene 3, CC1 belongs to identical eNB with CC2, but the antenna direction of two CC is inconsistent: CC1 is used to provide covering, and CC2 is used for improving the capacity of CC1 cell edge.In scene 4, CC1 belongs to eNB, CC2 belong to eNB RF remote (Radio Remote Header, RRH), RRH links to each other by optical fiber with eNB; CC1 is used to provide covering, and CC2 is used to provide the capacity of hot zones.In scene 5, CC1 belongs to identical eNB with CC2, and the signal on the CC2 frequency range can be amplified in the repeater of disposing in this eNB coverage (repeater), thereby has enlarged the coverage of CC2.
In the coverage of same eNB, the distance between each UE and the eNB may be different, and the propagation delay time of upstream data arrival eNB is also just different.In order to eliminate the interference between the user, the upstream data of a plurality of UE must arrive eNB simultaneously.Up Timing Advance (Timing Advance, TA) be exactly in order to realize that this purpose proposes, TA has remedied the radio propagation time delay between UE and the eNB, the size of TA has reflected that the distance between UE and the eNB is far and near, the TA value of the UE far away apart from eNB is big, the TA value of the UE near apart from eNB is smaller, thereby guarantees that data arrive the user simultaneously.
In Rel-10, for 5 kinds of scenes of carrier aggregation, no matter be FDD system or TDD system, up direction is all only supported the intra-band carrier aggregation, a UE only has unique TA value, promptly sends data on a plurality of CC simultaneously.Wherein, the method that UE obtains TA is two kinds: first kind of mode is in random access procedure, eNB is by accidental access response (Random Access Response, RAR) the TA value that need use of message informing UE, this TA value is an absolute value, and length is 11 bits, in fact, UE utilizes this 11 bit to convert, and what draw reality is the TA value of unit with microsecond (us); The second way is after the UE uplink synchronous situation variation, eNB controls control unit (MAC Control Element) notice UE by media interviews the TA value is upgraded, the TA value that MAC Control Element carries is a relative value, the length of TA value is 6 bits, the reference data of TA relative value is the previous old TA value of using, and the TA value sum that old TA value and MAC Control Element carry is the TA value after upgrading.Fig. 4 is the schematic diagram of MAC Control Element in the prior art, and as shown in Figure 4, the length of MAC Control Element is 1 byte (byte), and preceding 2 of MAC Control Element is reserved bit " R ", and remaining 6 are the TA value.In addition, also comprised Logic Channel Identifier (LCID) (scheming not shown) before MAC Control Element, it is used to identify the information type of MAC Control Element as the part of head (header), shows that promptly the information in the MAC Control Element is a TA.UE can discern the information that each bit is represented in the MAC Control Element according to LCID.
Need to prove, above-mentioned two kinds of methods are applicable to different scenes respectively, for example, UE obtains initial TA value by accidental access response, and under the RRC_CONNECTED state, because UE moves when causing the TA value to change, eNB can be by the new TA value of MAC CE notice UE.
But if need to support the inter-band carrier aggregation at up direction, above-mentioned scene 4 and 5 all requires UE must support a plurality of TA values, below concrete reason is introduced.
Fig. 5 is the schematic diagram of carrier aggregation scene 4, and as shown in Figure 5, in scene 5, eNB connects together with RF remote (RRH) by fiber optic stretch.UE sends to the uniform data ground of eNB and RRH and handles at the eNB place.Be wired connection between eNB and the RRH, the propagation delay time between the two can be ignored.The data that UE sends on CC1 directly send to eNB, and the data that send on CC2 are transmitted to eNB by optical fiber after being received by RRH.Because UE is different apart from the distance of eNB and RRH, in order to guarantee that the data sync on the different frequency arrives eNB, UE is in the transmitting time of data on CC1 in advance of data transmitting time on the CC2, and promptly no matter whether CC1 and CC2 are in same frequency range, and CC1 and CC2 need corresponding different TA values.
Fig. 6 is the schematic diagram of carrier aggregation scene 5, as shown in Figure 6, in scene 5, has disposed repeater (repeater) in the coverage of eNB, is used for extended coverage range.The frequency in some band limits can only be amplified in the repeater.On up (UL) direction, suppose that UE has disposed carrier wave CC1 and two carrier waves of CC2, and CC1 belongs to different frequency ranges with CC2, this moment, up direction was equivalent to the inter-band carrier aggregation.The coverage of CC1 is bigger, and the data that UE sends on CC1 can directly send to eNB; The coverage of CC2 is less, and UE could arrive eNB after the data that send on the CC2 have only through the repeater processing and amplifying, so the data on the CC2 have experienced extra processing delay.That is to say that UE sends data simultaneously on CC1 and CC2, but the moment of arrival eNB is inconsistent.So, arriving eNB in order to guarantee the data sync on the different frequency, CC1 and CC2 must corresponding different TA values.
And in the wireless communication system in future, various new business can continue to bring out, the speed of uplink service also can propose higher requirement than Rel-10, but the frequency spectrum that will find continuously big section on up direction is to support ever-increasing uplink rate requirement not a duck soup, therefore, in order to make full use of existing frequency spectrum resource on the up direction, need on up direction, use the inter-band carrier aggregation technology.
To sum up, in the prior art, a UE only obtains a TA value, can't support carrier aggregation scene 4 and 5 at up direction, therefore, if the following inter-band carrier aggregation technology of on up direction, using, and enable to be applied in scene 4 and 5, then UE of inevitable requirement can obtain a plurality of TA values, yet prior art does not also propose corresponding solution.
Summary of the invention
In view of this, the invention provides the method that obtains up Timing Advance in a kind of carrier aggregation, can make a UE obtain a plurality of TA values.
For achieving the above object, technical scheme of the present invention is achieved in that
Obtain the method for up Timing Advance in a kind of carrier aggregation, in advance for user equipment (UE) disposes a plurality of uplink member carrier CC, use a plurality of up CC that is disposed to carry out transmitting uplink data simultaneously for UE, this method comprises:
A, base station eNB are divided into a plurality of groups with a plurality of up CC, and the quantity of the up CC that each group is included is at least one, and the sign of group under grouping information and each the up CC is informed UE;
B, eNB are the different up timing advance TA value of each group's configuration, and each group of UE obtains the TA value of this group's correspondence respectively by random access procedure, and each up CC is with the TA value of the group's correspondence TA value as self correspondence in this group.
This method further comprises:
Step C, eNB send the TA updating value of each group's correspondence to UE, for each group, the TA value addition that UE is corresponding with this group among the step B with the TA updating value of this group's correspondence, as TA value after the renewal of this group's correspondence, in this group each up CC with the renewal of group's correspondence after the TA value as the renewal of self correspondence after the TA value.
The described method that a plurality of up CC are divided into a plurality of groups of steps A comprises:
The up CC that will belong to similar frequency bands is divided into same group; Or,
To belong to different frequency range, but the absolute value of frequency interval is divided into same group less than the up CC of first thresholding, will belongs to similar frequency bands, but the absolute value of frequency interval is divided into different groups greater than the up CC of second thresholding.
The described sign with group under grouping information and each the up CC of steps A informs that the method for UE comprises: eNB sends radio resource control RRC to UE and connects reconfiguration message, and this message is carried the sign of grouping information and the affiliated group of each up CC.
The method that sends the TA updating value of each group's correspondence to UE described in the step C is: eNB disposes the media interviews MAC Control Element of any one descending CC, MAC Control Element carries the TA updating value of all group's correspondences, and the MAC Control Element of the described TA of carrying updating value is sent to UE.
In described MAC Control Element, identify the TA updating value of a plurality of groups correspondence with the bitmap of first byte, wherein, if the TA updating value of carrying is N, then the byte number of MAC Control Element is N+1, wherein, the group of the TA updating value correspondence that first byte representation carries, all the other N byte is represented the TA updating value of each group's correspondence respectively successively according to the order of group, in a described N byte, the front two of each byte is a reserved bit, and remaining six is the TA updating value of this group's correspondence.
If the TA updating value that MAC Control Element carries is N, then the byte number of MAC Control Element is N, and the front two of each byte is the sign of this group of expression, and remaining six is the TA updating value of this group's correspondence.
The method that sends the TA updating value of each group's correspondence to UE described in the step C is: eNB disposes a plurality of media interviews MAC Control Element of any one descending CC, each MAC Control Element carries the TA updating value of group's correspondence, and each MAC Control Element of the described TA of carrying updating value is sent to UE.
The method that sends the TA updating value of each group's correspondence to UE described in the step C is: eNB disposes a plurality of MAC Control Element of a plurality of descending CC, each MAC Control Element carries the TA updating value of group's correspondence, and each MAC Control Element of the described TA of carrying updating value is sent to UE.
If the TA updating value that MAC Control Element carries is N, then the quantity summation of MAC Control Element is N, and wherein, each MAC Control Element is a byte, the front two of each byte is the sign of this group of expression, and remaining six is the TA updating value of this group's correspondence.
According to technical scheme provided by the present invention, eNB is divided into a plurality of groups with a plurality of up CC, the quantity of the up CC that each group is included is at least one, and the sign of group under grouping information and each the up CC informed UE, eNB is the different TA value of each group's configuration, each group of UE obtains the TA value of this group's correspondence respectively by random access procedure, each up CC is with the TA value of the group's correspondence TA value as self correspondence in this group, as seen, method provided by the present invention can make a UE obtain a plurality of TA values.
In addition, for the present invention still continues to use the method that initial TA value is transmitted in the prior art, and the transmission method of TA updating value, only carrying out initial TA value when transmitting, consider as how group be that unit passes to UE with a plurality of TA values, when carrying out the transmission of TA updating value, consideration is changed to realize the transmission of a plurality of TA values the form of MAC Control Element, therefore, the solution of the present invention has guaranteed the backwards compatibility to the LTE version.
Description of drawings
Fig. 1 is the schematic diagram of intra-band carrier aggregation.
Fig. 2 is the schematic diagram of inter-band carrier aggregation.
Fig. 3 is 5 kinds of scene schematic diagrames of carrier aggregation.
Fig. 4 is the schematic diagram of MAC Control Element in the prior art.
Fig. 5 is the schematic diagram of carrier aggregation scene 4.
Fig. 6 is the schematic diagram of carrier aggregation scene 5.
Fig. 7 is the flow chart that obtains the method for up Timing Advance in a kind of carrier aggregation provided by the present invention.
Fig. 8 represents the schematic diagram of the embodiment of two TA updating value for adopting bitmap.
Fig. 9 represents the schematic diagram of the embodiment of two TA updating value for adopting reserved bit " R ".
Figure 10 is the schematic diagram of the embodiment of two TA updating value two MAC Control Element being included in same descending CC respectively.
Figure 11 is the schematic diagram of the embodiment of two TA updating value two MAC Control Element being included in two descending CC respectively.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, scheme of the present invention is described in further detail.
Fig. 7 is the flow chart that obtains the method for up Timing Advance in a kind of carrier aggregation provided by the present invention.The present invention can be applied under the situation of up inter-band carrier aggregation, can support carrier aggregation scene 4 and 5 especially, before step 101,, use a plurality of up CC that is disposed to carry out transmitting uplink data simultaneously for UE in advance for UE disposes a plurality of up CC.According to the regulation of present agreement, for the quantity of the up CC of UE configuration mostly is 5 most.
In addition, easy in order to describe, unless stated otherwise, following CC all refers to up CC.
Below, method shown in Figure 7 is described in detail, as shown in Figure 7, this method may further comprise the steps:
With the purpose of CC grouping is the complexity that inserts at random in order to reduce, and same group of interior CC has identical TA value, and UE only need initiate a random access procedure promptly can obtain the TA value that this CC organizes interior all CC correspondences.
In this step, the method for grouping is more flexible, the not specifically qualification of quantity that divides group to the method and the institute of grouping.At this, be that example describes only with two kinds of group technologies:
The first, the CC that will belong to similar frequency bands is divided into same group.
For example, suppose that UE supports 5 CC:CC1, CC2, CC3, CC4, CC5, CC 1 and CC2 belong to frequency range A, CC3 and CC4 belong to frequency range B, and CC5 belongs to frequency range C, then can divide CC1 and CC2 into the 1st group, divide CC3 and CC4 into the 2nd group, CC5 is divided into the 3rd group.
Because the CC in the same frequency range has similar transmission characteristic, the CC of same frequency range can be divided into and be one group, therefore can be the identical TA value of CC configuration of same frequency range.Up of Rel-10 supports the intra-band carrier aggregation, and UE has unique TA value, is exactly this reason.
The second, will belong to different frequency range, but the absolute value of frequency interval is divided into same group less than the CC of first thresholding, will belong to similar frequency bands, but the absolute value of frequency interval is divided into different groups greater than the CC of second thresholding.
That is to say that though if several CC belong to different frequency range, the frequency of these several CC is very approaching, also these several CC can be divided into same group; Otherwise though if several CC belong to similar frequency bands, the frequency distance of these several CC is very big, also these several CC can be divided into not on the same group.
For example, suppose that UE supports 5 CC:CC1, CC2, CC3, CC4, CC5, CC1 and CC2 belong to frequency range A, CC3 and CC4 belong to frequency range B, CC5 belongs to frequency range C, if the absolute value of the difference of the frequency of CC2 and CC3 is less than first thresholding, then can divide CC2 and CC3 into the 1st group, if the absolute value of the difference of the frequency of CC4 and CC5 is less than first thresholding, then can divide CC4 and CC5 into the 2nd group, if the absolute value of the difference of the frequency of CC1 and CC2 is greater than second thresholding, then CC1 is not divided to the 1st group, CC1 can be divided into the 3rd group separately.
The CC that will be in a plurality of different frequency ranges is divided in the same CC group can reduce the complexity that inserts at random, and the CC that will be in same frequency range is divided into the accuracy that can improve uplink synchronous in the different CC groups.
In this step, eNB informs UE with grouping information, grouping information is used to represent which group which CC has been divided to, simultaneously, eNB also informs UE with the sign of group under each CC, the form of the sign of group can only be used for different groups are distinguished for arbitrary forms such as numbering, index.The concrete grammar of informing is: eNB sends RRC to UE and connects reconfiguration message, and this message is carried the sign of grouping information and the affiliated group of each up CC.
Particularly, when eNB by RRC connect reconfiguration message (RRC Connection Reconfiguration) to the Serving cell of UE be configured/when reshuffling, the RRC parameter configuration comprises the parameter configuration of cell-level and the parameter configuration of UE level.The parameter configuration of so-called cell-level is meant that the parameter configuration of this part all is suitable for all UE in the same eNB; And the parameter configuration of UE level refers to that then the parameter configuration of this part is specially adapted for current UE.ENB can be included in the parameter configuration of cell-level in the grouping information and little group id of notice UE about CC, also can be included in the parameter configuration of UE level.If be included in the parameter configuration of cell-level, the CC packet mode all is identical concerning all UE so.If the grouping information of CC is included in the parameter configuration of UE level, the CC packet mode can be different concerning different UEs.
In this step, be specially the great TA value of which little configuration set according to actual conditions and definite, for example, in conjunction with scene 4, for the UE that is in CC1 and the CC2 superimposed coverage area, then the TA value of group's correspondence is big under the CC1, and the TA value of group's correspondence is littler under the CC2.The method of concrete configuration can be with reference to the principle that disposes different TA values in the prior art for different UEs.
UE will obtain initial TA value (11 bit), must carry out random access procedure, and in fact, UE utilizes this 11 bit to convert, and what draw reality is the TA value of unit with microsecond (us), and this is identical with prior art.This step difference with the prior art is: the acquisition of each TA value all needs corresponding random access procedure to finish, and supposes to have 3 groups, then must obtain the TA value of each group's correspondence by three random access procedures respectively.The random access procedure of each group is identical with prior art, will not give unnecessary details herein.
Illustrate, suppose that CC1 and CC2 divide the 1st group into, CC3 and CC4 divide the 2nd group into, CC5 is divided into the 3rd group, then the 1st group obtains the TA_1 of the 1st group's correspondence by random access procedure, the 2nd group obtains the TA_2 of the 2nd group's correspondence by random access procedure, and the 3rd group obtains the TA_3 of the 3rd sub-district correspondence by random access procedure.
After each group obtains TA value, then in this group each CC with the TA value of group's correspondence TA value, for example as self correspondence, the TA value of CC1 correspondence is TA_1, and the TA value of CC2 correspondence is TA_1, and the TA value of CC3 correspondence is TA_2, the TA value of CC4 correspondence is TA_2, and the TA value of CC5 correspondence is TA_3.
Further, similar with prior art, if since UE move or other reasons makes UE uplink synchronous situation variation, eNB also upgrades the TA value by MAC Control Element notice UE, unlike the prior art be, in the prior art, MAC Control Element only need carry a TA value, and in the present invention, needs the TA value of different CC is upgraded, therefore the content that need carry MAC Control Element and form etc. are changed, and describe in detail below in conjunction with step 103.
In this step, eNB can have following several mode to the TA updating value that UE sends group's correspondence:
First method, eNB disposes the MAC Control Element of any one descending CC, and MAC Control Element carries the TA updating value of all group's correspondences, and the MAC Control Element of the described TA of carrying updating value is sent to UE.
In first method, if a plurality of TA updating value send in the same MAC Control Element of same descending CC, need to introduce new MAC Control Element form, because the TA value MAC Control Element before Rel-10 reaches in the protocol version is a regular length, length is 1 byte (byte), can't satisfy the requirement of a plurality of TA value variable-length MAC Control Element.
A plurality of TA updating value are included in the same MAC Control Element and send, and different implementation methods is also arranged, below only with two example explanations.
For example, a kind of method is in this MAC Control Element, identify the TA updating value (first byte is called bitmap) of a plurality of groups correspondence with the bitmap (Bitmap) of a byte, for example, if the TA updating value of carrying is N, then the byte number of MAC Control Element is N+1, wherein, the group of the TA updating value correspondence that first byte representation carries, all the other N byte is represented the TA updating value of each group's correspondence respectively successively according to the order of group, in this N byte, the front two of each byte is reserved bit " R ", and remaining six is the TA updating value of this group's correspondence.Fig. 8 represents the schematic diagram of the embodiment of two TA updating value for adopting bitmap, as shown in Figure 8, bitmap comprises triplex row, each row is 8 bits, it is byte of each behavior, the group of the first byte representation TA updating value correspondence, if what carry is the TA updating value of the 1st group and the 2nd group's correspondence, then first byte is 00000011, by that analogy, be the TA updating value of the 1st group, the 2nd group and the 3rd group's correspondence as if what carry, then first byte is 00000111, if what carry is the TA updating value of the 2nd group and the 3rd group's correspondence, then first byte is 00000110.At this, Fig. 8 is only to carry the 1st group and the 2nd group is an example.Front two in second byte is reserved bit " R ", remaining six is the TA updating value TA_1 of the 1st group's correspondence, front two in the 3rd byte is reserved bit " R ", remaining six is the TA updating value TA_2 of the 2nd group's correspondence, as seen, the form of second byte and the 3rd byte is identical with the form of MAC Control Element in the prior art.Need to prove that the form of above-mentioned bitmap is not to be used for limiting only having above-mentioned a kind of execution mode only for illustrating.
For example, another kind method is in MAC Control Element, utilize reserved bit " R " to represent the TA updating value of this group's correspondence, for example, if the TA updating value of carrying is N, then the byte number of MAC Control Element is N, and the front two of each byte is the sign of this group of expression, and remaining six is the TA updating value of this group's correspondence.Fig. 9 represents the schematic diagram of the embodiment of two TA updating value for adopting reserved bit " R ", as shown in Figure 9, MAC Control Element comprises two bytes, in first byte, front two is represented the sign " 00 " of the 1st group, and remaining six is the TA updating value TA_1 of the 1st group's correspondence, in second byte, front two is represented the sign " 01 " of the 2nd group, and remaining six is the TA updating value TA_2 of the 2nd group's correspondence.
Because in above-mentioned first method, a plurality of TA updating value are included in the same MAC Control Element, therefore, it is identical that a plurality of TA updating value arrive the moment of UE.
In addition, before MAC Control Element, also comprise Logic Channel Identifier (LCID) (scheming not shown), it is as the part of head (header), be used to identify the information type of above-mentioned MAC Control Element, show that promptly the information in the MAC Control Element is a plurality of TA updating value, UE can discern the information that each bit is represented in the MAC Control Element according to LCID.
Second method, eNB disposes a plurality of MAC Control Element of any one descending CC, and each MAC Control Element carries the TA updating value of group's correspondence, and each MAC Control Element of the described TA of carrying updating value is sent to UE.
A plurality of TA updating value also can send in the different MAC Control Element of same descending CC, a plurality of MAC Control Element of a descending CC of eNB configuration, the quantity summation of MAC Control Element can equal the number summation of the TA updating value that need carry, and each MAC Control Element carries the TA updating value of group's correspondence.
For example, if the TA updating value of carrying is N, then the quantity summation of MAC Control Element is N, and wherein, each MAC Control Element is a byte, and the front two of each byte is the sign of this group, and remaining six is the TA updating value of this group's correspondence.Figure 10 is the schematic diagram of the embodiment of two TA updating value two MAC Control Element being included in same descending CC respectively, as shown in figure 10, MAC Control Element 1 is a byte, front two is represented the sign " 00 " of the 1st group, remaining six is the TA updating value TA_1 of the 1st group's correspondence, MAC Control Element 2 is a byte, and front two is represented the sign " 01 " of the 2nd group, and remaining six is the TA updating value TA_2 of the 2nd group's correspondence.
Because in above-mentioned second method, a plurality of TA updating value are included in the different MAC Control Element, therefore, the moment of a plurality of TA updating value arrival UE may be inequality.
In addition, before each MAC Control Element, also comprise Logic Channel Identifier (LCID) (scheming not shown), it is used to identify the information type of above-mentioned MAC Control Element as the part of head (header), and UE can discern the information that each bit is represented in the MAC Control Element according to LCID.
The third method, eNB disposes a plurality of MAC Control Element of a plurality of descending CC, and each MAC Control Element carries the TA updating value of group's correspondence, and each MAC Control Element of the described TA of carrying updating value is sent to UE.
A plurality of TA updating value also can send in the different MAC Control Element of the descending CC of difference, eNB disposes a plurality of MAC Control Element of a plurality of descending CC, the quantity summation of MAC Control Element can equal the number summation of the TA updating value that need carry, and each MAC Control Element carries the TA updating value of group's correspondence.
For example, if the TA updating value of carrying is N, then the quantity summation of MAC Control Element is N, and wherein, each MAC Control Element is a byte, and the front two of each byte is the sign of this group of expression, and remaining six is the TA updating value of this group's correspondence.Figure 11 is the schematic diagram of the embodiment of two TA updating value two MAC Control Element being included in two descending CC respectively.As shown in figure 11, the MAC Control Element 1 of eNB configuration CC1, MAC Control Element 1 is a byte, and front two is represented the sign " 00 " of the 1st group, and remaining six is the TA updating value TA_1 of the 1st group's correspondence.The MAC Control Element 2 of eNB configuration CC2, MAC Control Element 2 is a byte, and front two is represented the sign " 01 " of the 2nd group, and remaining six is the TA updating value TA_2 of the 2nd group's correspondence.
Because in above-mentioned the third method, a plurality of TA updating value are included in the different MAC Control Element of different descending CC, therefore, the moment of a plurality of TA updating value arrival UE may be inequality.
In addition, before each MAC Control Element, also comprise Logic Channel Identifier (LCID) (scheming not shown), it is used to identify the information type of above-mentioned MAC Control Element as the part of head (header), and UE can discern the information that each bit is represented in the MAC Control Element according to LCID.
So far, this flow process finishes.
To sum up, in the present invention, eNB is divided into a plurality of groups with a plurality of up CC, the quantity of the up CC that each group is included is at least one, and the sign of group under grouping information and each the up CC informed UE, eNB is the different TA value of each group's configuration, each group of UE obtains the TA value of this group's correspondence respectively by random access procedure, each up CC is with the TA value of the group's correspondence TA value as self correspondence in this group, as seen, method provided by the present invention can make a UE obtain a plurality of TA values.
In addition, for the present invention still continues to use the method that initial TA value is transmitted in the prior art, and the transmission method of TA updating value, only carrying out initial TA value when transmitting, consider as how group be that unit passes to UE with a plurality of TA values, when carrying out the transmission of TA updating value, consideration is changed to realize the transmission of a plurality of TA values the form of MAC Control Element, therefore, the solution of the present invention has guaranteed the backwards compatibility to the LTE version.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. obtain the method for up Timing Advance in the carrier aggregation, in advance for user equipment (UE) disposes a plurality of uplink member carrier CC, a plurality of up CC that is disposed for the UE use carries out transmitting uplink data simultaneously, it is characterized in that this method comprises:
A, base station eNB are divided into a plurality of groups with a plurality of up CC, and the quantity of the up CC that each group is included is at least one, and the sign of group under grouping information and each the up CC is informed UE;
B, eNB are the different up timing advance TA value of each group's configuration, and each group of UE obtains the TA value of this group's correspondence respectively by random access procedure, and each up CC is with the TA value of the group's correspondence TA value as self correspondence in this group.
2. method according to claim 1 is characterized in that, this method further comprises:
Step C, eNB send the TA updating value of each group's correspondence to UE, for each group, the TA value addition that UE is corresponding with this group among the step B with the TA updating value of this group's correspondence, as TA value after the renewal of this group's correspondence, in this group each up CC with the renewal of group's correspondence after the TA value as the renewal of self correspondence after the TA value.
3. method according to claim 2 is characterized in that, the described method that a plurality of up CC are divided into a plurality of groups of steps A comprises:
The up CC that will belong to similar frequency bands is divided into same group; Or,
To belong to different frequency range, but the absolute value of frequency interval is divided into same group less than the up CC of first thresholding, will belongs to similar frequency bands, but the absolute value of frequency interval is divided into different groups greater than the up CC of second thresholding.
4. method according to claim 2, it is characterized in that, the described sign with group under grouping information and each the up CC of steps A informs that the method for UE comprises: eNB sends radio resource control RRC to UE and connects reconfiguration message, and this message is carried the sign of grouping information and the affiliated group of each up CC.
5. method according to claim 2, it is characterized in that, the method that sends the TA updating value of each group's correspondence to UE described in the step C is: eNB disposes the media interviews MAC Control Element of any one descending CC, MAC Control Element carries the TA updating value of all group's correspondences, and the MAC Control Element of the described TA of carrying updating value is sent to UE.
6. method according to claim 5, it is characterized in that, in described MAC Control Element, identify the TA updating value of a plurality of groups correspondence with the bitmap of first byte, wherein, if the TA updating value of carrying is N, then the byte number of MAC Control Element is N+1, wherein, the group of the TA updating value correspondence that first byte representation carries, all the other N byte is represented the TA updating value of each group's correspondence respectively successively according to the order of group, in a described N byte, the front two of each byte is a reserved bit, and remaining six is the TA updating value of this group's correspondence.
7. method according to claim 5, it is characterized in that if the TA updating value that MAC Control Element carries is N, then the byte number of MAC Control Element is N, the front two of each byte is the sign of this group of expression, and remaining six is the TA updating value of this group's correspondence.
8. method according to claim 2, it is characterized in that, the method that sends the TA updating value of each group's correspondence to UE described in the step C is: eNB disposes a plurality of media interviews MAC Control Element of any one descending CC, each MAC Control Element carries the TA updating value of group's correspondence, and each MAC Control Element of the described TA of carrying updating value is sent to UE.
9. method according to claim 2, it is characterized in that, the method that sends the TA updating value of each group's correspondence to UE described in the step C is: eNB disposes a plurality of MAC Control Element of a plurality of descending CC, each MAC Control Element carries the TA updating value of group's correspondence, and each MAC Control Element of the described TA of carrying updating value is sent to UE.
10. according to Claim 8 or 9 described methods, it is characterized in that, if the TA updating value that MAC Control Element carries is N, then the quantity summation of MAC Control Element is N, wherein, each MAC Control Element is a byte, and the front two of each byte is the sign of this group of expression, and remaining six is the TA updating value of this group's correspondence.
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| CN201110038988.7A CN102158948B (en) | 2011-02-16 | 2011-02-16 | Method for obtaining up time advance in carrier aggregation |
| PCT/CN2011/083401 WO2012109937A1 (en) | 2011-02-16 | 2011-12-02 | Method for obtaining uplink timing advance in carrier aggregation |
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| CN201110038988.7A CN102158948B (en) | 2011-02-16 | 2011-02-16 | Method for obtaining up time advance in carrier aggregation |
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| CN102158948B (en) | 2014-01-15 |
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