CN110233714B - LTE preamble distribution method and device - Google Patents
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- 230000007774 longterm Effects 0.000 claims description 5
- 230000000977 initiatory effect Effects 0.000 claims description 2
- 230000002776 aggregation Effects 0.000 description 7
- 238000004220 aggregation Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000013475 authorization Methods 0.000 description 3
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- 230000036963 noncompetitive effect Effects 0.000 description 2
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- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/0008—Wavelet-division
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
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Abstract
The application provides an LTE preamble distribution method and device, which are applied to an FDD cell comprising a pair of FDD carriers and at least one different frequency point carrier, wherein the pair of FDD carriers comprises a downlink carrier and an uplink carrier, the downlink carrier is a downlink carrier in the FDD cell, the uplink carrier is an uplink main carrier in the FDD cell, and the different frequency point carrier is an uplink auxiliary carrier in the FDD cell; the method comprises the following steps: dividing the preamble of the FDD cell into N preamble groups, wherein the preamble in each preamble group is a continuous preamble sequence; wherein, N is the number of uplink carriers in the FDD cell; and allocating a preamble group for each uplink carrier, wherein the N uplink carriers correspond to the N preamble groups one by one. The method can solve the problem of random access collision on different uplink carriers.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an LTE preamble allocation method and apparatus.
Background
In order to provide higher service rates, 3GPP has proposed a rate requirement of 1Gbps downlink in the LTE-Advanced phase. Meanwhile, due to factors such as shortage of wireless spectrum resources, spectrum resources owned by many operators are often discontinuous, and each single frequency band is difficult to meet the requirement of LTE-Advanced on bandwidth. Therefore, carrier aggregation is introduced in the Release 10(TR 36.913) stage by 3GPP, and the user peak rate is multiplied by aggregating member carriers different in the same frequency band and different frequency bands to a larger bandwidth, so that the user peak rate can be multiplied by 40MHz to 100MHz, and the peak rate of 300Mbps to 750Mbps or even more than 1Gbps (4x4MIMO) is provided, so as to meet the requirements of 3 GPP.
The carrier aggregation defined by 3GPP has the following constraints:
CA UEs support asymmetric carrier aggregation, i.e. the number of component carriers aggregated for downlink and uplink may be different, but the number of uplink component carriers cannot be larger than for downlink.
The frame structure of each cc (component carrier), i.e., component carrier, is the same as 3GPP Release 8, achieving downward compatibility.
The aggregated carriers are R8/9 compatible, i.e. R8/9 terminals can send/receive data on one of the carriers.
The 3GPP carrier aggregation introduces a PCell \ SCell: the PCell (Primary Cell) is a Cell where the UE performs initial connection establishment, or performs RRC connection reestablishment, or is a Primary Cell designated in the handover process. The PCell is responsible for RRC communication with the UE. SCell (Secondary Cell) is added at RRC reconfiguration to provide additional radio resources, without any RRC communication between SCell and UE. The PCell is determined at connection establishment (connection establishment), and the SCell is added/modified/released by an RRC connection reconfiguration message RRCConnectionReconfiguration after an initial security activation procedure (initial security activation procedure).
In Release 10, for simplicity, the use of different ta (timing advance) values between different aggregated cells is not considered in Rel-10, that is, it is assumed that uplink timing between the aggregated cells (PCell and SCells) is synchronous, so for scenario 4 and scenario 5 defined by 3GPP TS36.300 Annex J, uplink carrier aggregation cannot be supported, and random access is performed only on PCell.
In Release 10, uplink timing between cells (PCell and SCells) of carrier aggregation may be different, and random access may also be performed on the SCell, and the purpose of the random access is mainly to acquire timing information on the SCell.
Because in practical networking applications, there are specific requirements for large-bandwidth uplink services such as video upload, and unlike 3GPP carrier aggregation, a configuration in which the number of uplink carriers is higher than the number of downlink carriers can be introduced in an LTE system, and 1 for an available Frequency Division Duplex (FDD) carrier and a plurality of available unlicensed pure uplink carriers, a special FDD cell can be established in the LTE system: the cell includes a pair of FDD carriers and 1 or more pure uplink carriers. In a pair of FDD carriers in a cell, a downlink carrier is the only downlink carrier in the special FDD cell, and an uplink carrier is the uplink main carrier in the special FDD cell. All the pure uplink carriers in the cell are uplink secondary carriers of the cell.
In a common LTE FDD cell, an eNodeB and UE identify different PRACHs through RA-RNTIs: the value of the RA-RNTI is determined by the index of the first subframe of the PRACH and the index of the frequency domain resource used by the PRACH, as shown in the following formula. After the UE sends the PRACH, the PDCCH scrambled by the RA-RNTI on a PDCCH search space in a control domain is detected in a random access response window according to the RA-RNTI corresponding to the PRACH to obtain the scheduling information of RAR, a corresponding PDSCH is received according to the scheduling information of the RAR, the uplink authorization information of MSG3 is obtained from the PDSCH, and MSG3 is sent on the uplink resource indicated by the uplink authorization information.
RA-RNTI＝1+t_id+10*f_id
In the above equation, t _ id is the subscript of the first subframe of the PRACH (0 is greater than or equal to t _ id <10), and f _ id is the subscript of the frequency domain resource occupied by the PRACH (0 is greater than or equal to f _ id < 6).
In the LTE special cell, since the primary and secondary carriers need to be randomly accessed to obtain the timing of the primary and secondary carriers, when different terminals may be accessed from the primary and secondary carriers on the same time-frequency resource (t _ id is the same as t _ id), the RA-RNTIs are the same, and if the preamble sequences used by the terminals are the same, the terminals cannot distinguish whether the received RAR is a response of the terminals.
Therefore, in such an FDD cell including one downlink carrier and multiple uplink carriers, when access is simultaneously and randomly made from different uplink carriers, a collision situation may occur.
Disclosure of Invention
In view of this, the present application provides an LTE preamble allocation method and apparatus, which can solve the problem of random access collision on different uplink carriers.
In order to solve the technical problem, the technical scheme of the application is realized as follows:
a Long Term Evolution (LTE) preamble allocation method is applied to an FDD cell comprising a pair of Frequency Division Duplex (FDD) carriers and at least one different frequency point carrier, wherein the pair of FDD carriers comprises a downlink carrier and an uplink carrier, the downlink carrier is a downlink carrier in the FDD cell, the uplink carrier is an uplink main carrier in the FDD cell, and the different frequency point carrier is an uplink auxiliary carrier in the FDD cell; the method comprises the following steps:
dividing the preamble of the FDD cell into N preamble groups, wherein the preamble in each preamble group is a continuous preamble sequence; wherein, N is the number of uplink carriers in the FDD cell;
and allocating a preamble group for each uplink carrier, wherein the N uplink carriers correspond to the N preamble groups one by one.
A Long Term Evolution (LTE) preamble distribution device is applied to a base station in an FDD cell comprising a pair of Frequency Division Duplex (FDD) carriers and at least one different frequency point carrier, wherein the pair of FDD carriers comprises a downlink carrier and an uplink carrier, the downlink carrier is a downlink carrier in the FDD cell, the uplink carrier is an uplink main carrier in the FDD cell, and the different frequency point carrier is an uplink auxiliary carrier in the FDD cell; the device comprises:
a dividing unit, configured to divide the preamble of the FDD cell into N preamble groups, where the preamble in each preamble group is a continuous preamble sequence; wherein, N is the number of uplink carriers in the FDD cell;
and the distribution unit is used for distributing a leader group divided by the dividing unit for each uplink carrier, and the N uplink carriers correspond to the N leader groups one by one.
According to the technical scheme, when the pilot allocation is performed on the FDD cell, different pilots are allocated to different uplink carriers, so that when different uplink carriers are accessed, the accessed UE can be distinguished, and the problem of random access conflict on different uplink carriers can be solved.
Drawings
Fig. 1 is a schematic diagram illustrating a flow for implementing LTE preamble allocation in an embodiment of the present application;
fig. 2 is a schematic diagram of preamble allocation in an embodiment of the present application;
fig. 3 is a schematic structural diagram of an apparatus applied to the above-described technology in the embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the technical solutions of the present invention are described in detail below with reference to the accompanying drawings and examples.
The embodiment of the application provides a Long Term Evolution (LTE) preamble allocation method, which is applied to an FDD cell comprising a pair of FDD carriers and at least one different frequency point carrier, wherein the pair of FDD carriers comprises a downlink carrier and an uplink carrier, the downlink carrier is a downlink carrier in the FDD cell, the uplink carrier is an uplink main carrier in the FDD cell, and the different frequency point carrier is an uplink auxiliary carrier in the FDD cell.
When the FDD cell is subjected to preamble allocation, different preambles are allocated to different uplink carriers, so that when different uplink carriers are accessed, the accessed UE can be distinguished, and the problem of random access conflict on different uplink carriers can be solved.
The following describes in detail a procedure for implementing LTE preamble allocation in an embodiment of the present application with reference to the drawings.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a process for implementing LTE preamble allocation in the embodiment of the present application. The method comprises the following specific steps:
And N is the number of uplink carriers in the FDD cell. Since one preamble group needs to be allocated to each uplink carrier, how many uplink carriers exist, and how many preamble groups are divided.
When dividing the N preamble groups, the number of preambles in each preamble group is not limited, and in specific implementation, the number of preambles may be allocated according to actual requirements of each uplink carrier (uplink primary carrier and uplink secondary carrier) in the FDD cell.
Referring to fig. 2, fig. 2 is a schematic diagram of preamble allocation in the embodiment of the present application.
In fig. 2, for example, an FDD cell includes 2 uplink carriers, one is an uplink primary carrier, and one is an uplink secondary carrier, the preamble of the FDD cell is divided into 2 preamble groups, and the preamble in each preamble group is a continuous preamble sequence, in which, when specifically implemented, first M of 64Preambles (64Preambles in access cells) in the FDD cell are divided into one group, and last 64-M Preambles are divided into one group, that is, 64Preambles in the FDD cell are sequentially divided into each preamble group, and are divided into different preamble groups without hopping.
In the embodiment of the present application, the preamble group allocated to each uplink carrier is the only one of the N divided preamble groups, and each uplink carrier does not share one preamble group.
In the embodiment of the present application, the preamble group allocated to each uplink carrier includes: a preamble for contention random access and a preamble for non-contention random access, wherein the preamble for contention random access includes Group a and Group B.
The method is implemented in the prior art when the preamble group in each uplink carrier is further divided into competitive and non-competitive random access, so that the improvement on the protocol standard is small, and when the preamble is selected subsequently, the preamble can be selected according to the prior protocol standard, and only the preamble group in which the preamble is selected is appointed.
Still taking fig. 2 as an example, the preamble groups corresponding to the first M preamble codes are allocated to the uplink primary carrier, and the preamble groups corresponding to the last 64-M preamble codes are allocated to the uplink secondary carrier.
A preamble in PUL corresponding to an uplink primary carrier includes: a preamble for a competitive random access (NumOfPrrambles in content in PUL) and a preamble for a non-competitive random access (NumOfPrrambles in content-free in PUL); wherein the preamble for the contended random access comprises: NumOfGroupA in PUL and NumOfGroupB in PUL.
A preamble in SUL corresponding to an uplink secondary carrier includes: a preamble for contention random access (NumOfPrrambles in content in SUL) and a preamble for non-contention random access (NumOfPrrambles in content-free in SUL); wherein the preamble for the contended random access comprises: NumOfGroupA in SUL and NumOfGroupB in SUL.
After the base station completes preamble allocation, the UE may perform random access in the configured preamble group.
When the UE is accessed for the first time, accessing through an uplink main carrier, acquiring a preamble group distributed for the uplink main carrier when the UE is accessed through the uplink main carrier, and performing random access by using a corresponding preamble according to the existing implementation; the method for acquiring the preamble group corresponding to the uplink primary carrier may be implemented according to the prior art.
And when the base station determines to switch the access of the UE from the first uplink carrier to the second uplink carrier, informing the UE to initiate random access by using the acquired leader group allocated to the second uplink carrier.
The first uplink carrier here may be an uplink primary carrier, and may also be an uplink secondary carrier; when the first uplink carrier is an uplink main carrier, the second uplink carrier is an uplink auxiliary carrier; when the first uplink carrier is an uplink auxiliary carrier, the second uplink carrier is an uplink main carrier or an auxiliary carrier other than the first uplink carrier.
The method for the UE to acquire the preamble group allocated to the second uplink carrier includes the following two steps:
first, when a base station determines to switch the access of a UE from a first uplink carrier to a second uplink carrier, a leading group allocated to the second carrier is sent to the UE, so that the EU acquires the leading group allocated to the second uplink carrier;
secondly, the base station sends the preamble group allocated to each uplink carrier to each UE through a broadcast message, so that the EU acquires the preamble group allocated to the second uplink carrier.
No matter what kind of method the UE uses to obtain the preamble group corresponding to the uplink carrier, the UE can store the obtained preamble group for use when subsequently switching to different uplink carriers, which specifically is:
and the UE stores the acquired leader group allocated for the uplink carrier, and when the random access is initiated again, the stored leader group corresponding to the uplink carrier is used for initiating the random access.
In the implementation of the present application, even if different UEs initiate random access on different uplink carriers using the same time-frequency resource, the base station can distinguish from the preamble sequence to perform random access responses such as uplink authorization and the like for UEs on different uplink carriers.
Based on the same inventive concept, the application also provides an LTE preamble allocation device, which is applied to a base station in an FDD cell including a pair of FDD carriers and at least one alien-frequency point carrier, wherein the pair of FDD carriers includes a downlink carrier and an uplink carrier, the downlink carrier is a downlink carrier in the FDD cell, the uplink carrier is an uplink primary carrier in the FDD cell, and the alien-frequency point carrier is an uplink secondary carrier in the FDD cell. Referring to fig. 3, fig. 3 is a schematic structural diagram of an apparatus applied to the above technology in the embodiment of the present application. The device includes:
a dividing unit 301, configured to divide the preamble of the FDD cell into N preamble groups, where the preamble in each preamble group is a continuous preamble sequence; wherein, N is the number of uplink carriers in the FDD cell;
an allocating unit 302, configured to allocate a preamble group divided by the dividing unit 301 to each uplink carrier, where the N uplink carriers correspond to the N preamble groups one to one.
Preferably, the first and second air flow paths are arranged in parallel,
the dividing unit 301, specifically, includes, in a preamble group allocated to each uplink carrier: a preamble for contention random access and a preamble for non-contention random access, wherein the preamble for contention random access includes Group a and Group B.
Preferably, when receiving a random access initiated by the UE using the acquired preamble group allocated to the uplink primary carrier, the UE is responded.
Preferably, the apparatus further comprises:
and the notification unit is used for notifying the UE to initiate random access by using the acquired leader group distributed for the second uplink carrier when the base station determines to switch the access of the user terminal UE from the first uplink carrier to the second uplink carrier.
The method for the UE to acquire the preamble group allocated to the second uplink carrier includes:
when a base station determines to switch the access of the UE from a first uplink carrier to a second uplink carrier, sending a leading group allocated to the second carrier to the UE, so that the EU acquires the leading group allocated to the second uplink carrier;
or the like, or, alternatively,
and the base station sends the leader group allocated to each uplink carrier to each UE through a broadcast message, so that the EU acquires the leader group allocated to the second uplink carrier.
Wherein, the first and the second end of the pipe are connected with each other,
the first uplink carrier is an uplink main carrier or an uplink auxiliary carrier;
when the first uplink carrier is an uplink main carrier, the second uplink carrier is an uplink auxiliary carrier;
when the first uplink carrier is an uplink auxiliary carrier, the second uplink carrier is an uplink main carrier or an auxiliary carrier other than the first uplink carrier.
The units of the above embodiments may be integrated into one body, or may be separately deployed; may be combined into one unit or may be further divided into a plurality of sub-units.
To sum up, when the preamble allocation is performed for the FDD cell, different preambles are allocated for different uplink carriers, so that when different uplink carriers are accessed, the accessed UE can be distinguished, and then the problem of random access collision on different uplink carriers can be solved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A Long Term Evolution (LTE) preamble allocation method is applied to an FDD cell comprising a pair of Frequency Division Duplex (FDD) carriers and at least one different frequency point carrier, wherein the pair of FDD carriers comprises a downlink carrier and an uplink carrier, the downlink carrier is a downlink carrier in the FDD cell, the uplink carrier is an uplink main carrier in the FDD cell, and the different frequency point carrier is an uplink auxiliary carrier in the FDD cell; the method is characterized by comprising the following steps:
dividing the preamble of the FDD cell into N preamble groups, wherein the preamble in each preamble group is a continuous preamble sequence; wherein, N is the number of uplink carriers in the FDD cell;
and allocating a preamble group for each uplink carrier, wherein the N uplink carriers correspond to the N preamble groups one by one.
2. The method of claim 1, wherein the preamble group allocated for each uplink carrier comprises: a preamble for a contention random access and a preamble for a non-contention random access, wherein the preamble for the contention random access includes Group a and Group B.
3. The method according to claim 1 or 2, characterized in that the method further comprises:
and the base station responds to the UE when receiving the random access initiated by the user terminal UE by using the acquired leader group distributed for the uplink main carrier.
4. The method of claim 3, further comprising:
and when the base station determines to switch the access of the UE from the first uplink carrier to the second uplink carrier, informing the UE to initiate random access by using the acquired leader group allocated to the second uplink carrier.
5. The method of claim 4, wherein the manner of the UE obtaining the preamble group allocated for the second uplink carrier comprises:
when a base station determines to switch the access of UE from a first uplink carrier to a second uplink carrier, sending a leading group distributed for the second carrier to the UE, so that the UE acquires the leading group distributed for the second uplink carrier;
or the like, or, alternatively,
and the base station sends the leader group distributed for each uplink carrier to each UE through a broadcast message, so that the UE acquires the leader group distributed for the second uplink carrier.
6. The method of claim 5,
the first uplink carrier is an uplink main carrier or an uplink auxiliary carrier;
when the first uplink carrier is an uplink main carrier, the second uplink carrier is an uplink auxiliary carrier;
when the first uplink carrier is an uplink auxiliary carrier, the second uplink carrier is an uplink main carrier or an auxiliary carrier other than the first uplink carrier.
7. The method of claim 5, further comprising:
and the UE stores the acquired leader group allocated for the uplink carrier, and when the random access is initiated again, the stored leader group corresponding to the uplink carrier is used for initiating the random access.
8. A Long Term Evolution (LTE) preamble distribution device is applied to a base station in an FDD cell comprising a pair of Frequency Division Duplex (FDD) carriers and at least one different frequency point carrier, wherein the pair of FDD carriers comprises a downlink carrier and an uplink carrier, the downlink carrier is a downlink carrier in the FDD cell, the uplink carrier is an uplink main carrier in the FDD cell, and the different frequency point carrier is an uplink auxiliary carrier in the FDD cell; it is characterized in that the device comprises:
a dividing unit, configured to divide the preamble of the FDD cell into N preamble groups, where the preamble in each preamble group is a continuous preamble sequence; wherein, N is the number of uplink carriers in the FDD cell;
and the distribution unit is used for distributing a leader group divided by the dividing unit for each uplink carrier, and the N uplink carriers correspond to the N leader groups one by one.
9. The apparatus of claim 8,
the dividing unit specifically allocates a preamble group to each uplink carrier, including: a preamble for contention random access and a preamble for non-contention random access, wherein the preamble for contention random access includes Group a and Group B.
10. The apparatus of claim 8 or 9, further comprising:
and the notification unit is used for notifying the UE to initiate random access by using the acquired leader group distributed for the second uplink carrier when the base station determines to switch the access of the user terminal UE from the first uplink carrier to the second uplink carrier.
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