CN106162881B - Data transmission method and device - Google Patents
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- CN106162881B CN106162881B CN201510165887.4A CN201510165887A CN106162881B CN 106162881 B CN106162881 B CN 106162881B CN 201510165887 A CN201510165887 A CN 201510165887A CN 106162881 B CN106162881 B CN 106162881B
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Abstract
The embodiment of the invention provides a data transmission method and a device, which are used for acquiring the time interval N occupied by repeated transmission of paging messages under a coverage enhancement level; determining N time intervals for repeated transmission of the paging message according to a User Equipment (UE) identity; determining a paging narrow band for repeatedly transmitting the paging message according to the coverage enhancement level; repeatedly transmitting the paging message on the determined paging narrowband and available subframes in the determined N time intervals; wherein N is a positive integer greater than or equal to 2.
Description
Technical Field
The present invention relates to wireless communication technologies, and in particular, to a data transmission method and apparatus.
Background
Machine Type Communication (MTC) or Machine to Machine (M2M) User Equipment (UE) is the main application form of the internet of things at present. Low power consumption and/or low cost are important guarantees for its large-scale application. The M2M devices currently deployed in the market are mainly based on Global System for Mobile communications (GSM) System. In recent years, as the spectrum efficiency of Long Term Evolution (LTE) systems is higher, and more mobile operators have determined LTE as the Evolution direction of future broadband wireless communication systems, various types of data services of M2M based on LTE will also be more attractive.
The cost of MTC UEs comes mainly from the baseband processing part and the radio frequency part. In order to reduce the cost of the MTC UE, reducing uplink and/or downlink transmission bandwidths (including baseband and radio frequency bandwidths) of the UE is a very effective way to reduce the cost of the MTC UE, for example, when the system bandwidth far exceeds 1.4MHz, all uplink and/or downlink transmission bandwidths of the MTC UE can only be narrow bandwidths such as 1.4 MHz. In addition to the above-described bandwidth reduction method, the mtue cost may be further reduced by a single reception antenna, a reduced transmission power, a reduced maximum Transport Block Size (TBS), and the like.
Since some MTC UEs are installed in basements of houses or in places covered by aluminum alloy windows or conventional thick-wall building structures, these UEs experience considerable penetration loss at the radio frequency interface compared to normal MTC UEs, and thus, in order to ensure normal data transmission of the UEs, it is necessary to enhance the coverage of the MTC UEs. Wherein the enhanced channel types include: a Physical Uplink or Downlink Shared Channel (PUSCH/PDSCH), a Physical Uplink/Downlink Control Channel (PUCCH/PDCCH), and the like. Wherein, the coverage enhancement of the PDSCH includes coverage enhancement of System Information Block (SIB) data, Paging (Paging) message, and coverage enhancement of unicast service data. To accumulate more energy to improve coverage, iterative methods are commonly used to achieve transmission enhancements for various channel types.
At present, unlike unicast service data, a base station configures Paging messages to be transmitted in a limited radio frame and subframe positions in a determined Paging Cycle (Paging Cycle), that is, available subframes for transmitting the Paging messages periodically appear at intervals of the Paging Cycle; if the above method were used along with coverage enhancement/repeated transmission of paging messages, combined reception/decoding across a large number of paging cycles would be employed to achieve coverage enhancement objectives, which would greatly increase the transmission delay of the paging message. On one hand, the longer transmission delay of the paging message causes the determined wireless resource to be occupied by the paging message for a long time, thereby being not beneficial to the cooperative scheduling of the wireless resource; on the other hand, a longer paging message transmission delay will also affect the normal transmission of other broadcast and/or unicast data in addition to the paging message.
Disclosure of Invention
In view of this, embodiments of the present invention provide a data transmission method and apparatus, which can greatly reduce transmission delay of a paging message.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:
the embodiment of the invention provides a data transmission method, which comprises the following steps:
acquiring the number N of time intervals occupied by repeated transmission of paging messages under the coverage enhancement level;
determining N time intervals for repeatedly transmitting the paging message according to the UE identification of the user equipment;
determining a paging narrow band for repeatedly transmitting the paging message according to the coverage enhancement level;
repeatedly transmitting the paging message on the determined paging narrowband and available subframes in the determined N time intervals;
wherein N is a positive integer greater than or equal to 2.
In the above scheme, for a frequency division duplex FDD system, the available subframes are subframe 0, subframe 4, subframe 5, and subframe 9, or all available subframes at least including subframe 0, subframe 4, subframe 5, and subframe 9; for a Time Division Duplex (TDD) system, the available subframes are subframe 0, subframe 1, subframe 5 and subframe 6, or all available subframes at least including subframe 0, subframe 1, subframe 5 and subframe 6; wherein, the all the available subframes comprise non-multicast and broadcast single frequency network MBSFN downlink subframes and MBSFN subframes without multicast service transmission.
In the above scheme, the acquiring the number N of the time intervals occupied by the repeated transmission of the paging message in the coverage enhancement level includes: acquiring the number N of time intervals occupied by repeated transmission of paging messages under the coverage enhancement level by indicating the broadcasted paging system parameters to the UE; or implicitly determining the number N of time intervals occupied by the repeated transmission of the paging message under the coverage enhancement level according to the available subframes.
In the foregoing solution, the determining, according to the UE identity, N time intervals for repeatedly transmitting the paging message includes: all time intervals in the range of each paging Cycle size P _ Cycle are partitioned by taking N continuous time intervals as granularity; determining one of all time interval blocks according to the UE identification; the N time intervals for repeatedly transmitting the paging message are N continuous time intervals contained in the block; the value of the P _ Cycle is obtained by a mode of indicating broadcasted system parameters or UE-specific signaling to the UE, and is an integral multiple of the time interval number occupied by the repeated transmission of the paging message with the maximum coverage enhancement grade.
In the foregoing solution, the determining one of all time interval blocks according to the UE identity includes: determining a first time interval according to the identity of the UE; determining N consecutive time intervals beginning with the first time interval as time interval blocks of the repeated transmission of the paging message.
In the foregoing solution, the calculation expression for determining the first time interval according to the UE identifier is as follows: TIN _1mod P _ Cycle ═ N (UE _ ID mod (P _ Cycle/N)); alternatively, TIN _1_ Temp mod P _ Cycle ═ N (UE _ IDmod (P _ Cycle/N)), and TIN _1 ═ TIN _1_ Temp + TIN _ O × N) mod P _ Cycle; wherein, P _ Cycle represents the size of the paging Cycle, UE _ ID represents the identity of the UE, TIN _1 represents the number of the first time interval, TIN _ O represents the bias of UE-specific time interval blocking, and TIN _1_ Temp represents an intermediate variable for calculating the TIN _ 1.
In the foregoing solution, in the process of repeatedly transmitting the paging message on the determined available subframes in the N time intervals and the determined paging narrowband, the method further includes: if conflict occurs when paging messages with different coverage enhancement grades are transmitted on the determined paging narrow band, the paging message with one coverage enhancement grade is randomly reserved; or, classifying the paging messages of different coverage enhancement classes into a unique paging message having a maximum coverage enhancement class and at least one paging message having a coverage enhancement class different from the maximum coverage enhancement class; combining the at least one paging message having a coverage enhancement level different from the maximum coverage enhancement level with the unique paging message having the maximum coverage enhancement level to obtain a combined paging message; and then transmitting the synthesized paging message in N time intervals corresponding to the only paging message with the maximum coverage enhancement grade.
In the above scheme, the paging narrowband is one of a set of narrowband that can be used for repeatedly transmitting a paging message; acquiring the narrowband set in a preset mode or in a mode of indicating broadcasted paging system parameters to UE; the narrowband set is independent of or overlaps with the system information block SIB and master information block MIB narrowband sets.
In the scheme, when the paging message collides with the transmission of the MIB or SIB1, the transmission of the paging message is abandoned; when the paging message collides with the transmission of other SIBs other than SIB1, the transmission of the paging message or the other SIBs is discarded.
In the above scheme, the manner of repeatedly transmitting the paging message is a narrowband frequency hopping manner.
In the above scheme, the method further comprises: for an FDD system, when the narrowband frequency hopping mode is on, if the available subframes are subframe 0, subframe 4, subframe 5, and subframe 9, a new frame timing corresponding to the paging message is determined.
In the above scheme, the method further comprises: when the narrowband frequency hopping mode is started, if the paging message and the broadcast and/or unicast data except the paging message adopt the overlapped narrowband set, the paging message is repeatedly transmitted in a mode that the paging message and the broadcast and/or unicast data except the paging message share the frequency hopping interval.
In the scheme, when the narrowband frequency hopping mode is started, the frequency hopping interval is equal to M time intervals; wherein, M is a natural number greater than or equal to 1, and the number N of time intervals occupied by the repeated transmission of the paging message under any coverage enhancement level is integral multiple of M; the hopping interval is preset or indicated to the UE by broadcasted system parameters.
In the above scheme, the number of time intervals occupied by the repeated transmission of the paging message with the Xth coverage enhancement level is an integral multiple of the number of time intervals occupied by the repeated transmission of the paging message with the Yth coverage enhancement level; wherein X and Y are positive integers of 1 or more, and X is less than Y.
In the above scheme, the method further comprises: when the available subframes are all available subframes at least containing the 4 subframes, acquiring all the available subframes by broadcasting system parameter indication to a UE; the broadcasted system parameters comprise MBSFN subframe configuration parameters, MBSFN subframe configuration parameters with multicast service transmission and TDD subframe configuration parameters.
In the above solution, the process of repeatedly transmitting the paging message has the following features: all physical resources in the paging narrowband are occupied, and the modulation mode is four-phase shift keying QPSK and fixed or limited transport block size TBS.
An embodiment of the present invention further provides a data transmission device, where the device includes: the device comprises an acquisition module, a determination module and a transmission module;
the acquisition module is used for acquiring the number N of time intervals occupied by the repeated transmission of the paging message under the coverage enhancement level;
the determining module is configured to determine, according to a UE identity, N time intervals for repeatedly transmitting the paging message; determining a paging narrow band for repeatedly transmitting the paging message according to the coverage enhancement level;
the transmission module is configured to repeatedly transmit the paging message on the determined available subframes in the N time intervals and the determined paging narrowband;
wherein N is a positive integer greater than or equal to 2.
In the above scheme, the obtaining module is specifically configured to obtain the number N of time intervals occupied by the repeated transmission of the paging message in the coverage enhancement level in a manner of indicating the broadcasted paging system parameter to the UE; or implicitly determining the number N of time intervals occupied by the repeated transmission of the paging message under the coverage enhancement level according to the available subframes.
In the foregoing solution, the determining module is specifically configured to block all time intervals within a range of a paging Cycle size P _ Cycle by using N time intervals as a granularity; determining one of all time interval blocks according to the UE identification; the N time intervals for repeatedly transmitting the paging message are N continuous time intervals contained in the block; the Paging Cycle value is indicated by a broadcasted system parameter or UE (user equipment) proprietary signaling and is an integral multiple of the time interval number occupied by the repeated transmission of the Paging message with the maximum coverage enhancement level.
In the foregoing solution, the determining module is specifically configured to determine a first time interval according to an identifier of the UE; determining N consecutive time intervals beginning with the first time interval as time interval blocks of the repeated transmission of the paging message.
In the above solution, the transmission module is further configured to arbitrarily reserve a paging message with one coverage enhancement level if a collision occurs when paging messages with different coverage enhancement levels are transmitted on the determined paging narrowband; or, classifying the paging messages of different coverage enhancement classes into a unique paging message having a maximum coverage enhancement class and at least one paging message having a coverage enhancement class different from the maximum coverage enhancement class; combining the at least one paging message having a coverage enhancement level different from the maximum coverage enhancement level with the unique paging message having the maximum coverage enhancement level to obtain a combined paging message; and then transmitting the synthesized paging message in N time intervals corresponding to the only paging message with the maximum coverage enhancement grade.
In the above scheme, the mode used by the transmission module for repeatedly transmitting the paging message is a narrowband frequency hopping mode.
In the foregoing solution, the determining module is further configured to determine, for an FDD system, when the narrowband frequency hopping mode is turned on, a new frame timing corresponding to the paging message if the available subframes are subframe 0, subframe 4, subframe 5, and subframe 9.
In the foregoing solution, the transmission module is further configured to, when the narrowband frequency hopping mode is turned on, if the paging message and the broadcast and/or unicast data except the paging message adopt an overlapped narrowband set, repeatedly transmit the paging message in a manner that the paging message and the broadcast and/or unicast data except the paging message share a frequency hopping interval.
The data transmission method and the device provided by the embodiment of the invention obtain the time interval number N occupied by the repeated transmission of the paging message under the coverage enhancement level; determining N time intervals for repeatedly transmitting the paging message according to the UE identification; determining a paging narrow band for repeatedly transmitting the paging message according to the coverage enhancement level; repeatedly transmitting the paging message on the determined paging narrowband and available subframes in the determined N time intervals; wherein N is a positive integer greater than or equal to 2. Therefore, the transmission delay of the paging message can be greatly reduced, and the long-time occupation of the repeatedly transmitted paging message on the wireless resource is avoided, so that the cooperative scheduling capability of the wireless resource is improved, and the influence on the normal transmission of other broadcast and/or unicast data is reduced.
Drawings
Fig. 1 is a schematic flow chart illustrating an implementation of a data transmission method according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating an implementation of determining N time intervals for repeatedly transmitting paging messages according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating the relationship between a paging narrowband and an SIB or MIB narrowband according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating that paging subframes other than subframe 0/4/5/9 cannot be received in the related art;
FIG. 5 is a diagram illustrating new frame timing for a paging message according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a data transmission apparatus according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating an example of determining a paging message retransmission resource according to a UE identity according to an embodiment of the present invention;
fig. 8 is a diagram illustrating an exemplary application of the present invention to sharing a hop interval with a paging message and unicast data.
Detailed Description
In the embodiment of the invention, the number N of time intervals occupied by the repeated transmission of the paging message under the coverage enhancement level is obtained; determining N time intervals for repeatedly transmitting the paging message according to the UE identification; determining a paging narrow band for repeatedly transmitting the paging message according to the coverage enhancement level; repeatedly transmitting the paging message on the determined paging narrowband and available subframes in the determined N time intervals.
Wherein N is a positive integer greater than or equal to 2.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic flow chart of an implementation of a data transmission method according to an embodiment of the present invention, and as shown in fig. 1, the data transmission method according to the embodiment of the present invention includes:
step S101: acquiring the number N of time intervals occupied by repeated transmission of paging messages under the coverage enhancement level;
wherein N is a positive integer greater than or equal to 2.
Specifically, acquiring the number N of time intervals occupied by the repeated transmission of the paging message in the coverage enhancement level includes: acquiring the number N of time intervals occupied by repeated transmission of paging messages under the coverage enhancement level by indicating the broadcasted paging system parameters to the UE; or, the number of time intervals N occupied by the repeated transmission of the paging message in the coverage enhancement level is implicitly determined according to the subframes (available subframes) available for the transmission of the paging message. For example, the different possible examples of subframes available for paging message transmission described above may be bundled with the number of time intervals N occupied by repeated transmissions at the coverage enhancement level, such that all subframes available for paging message transmission or one of the different examples of available subframes (e.g., subframe 0/4/5/9) always corresponds to a unique number of time intervals.
Wherein the time interval includes, but is not limited to: radio frames, half frames. Given the potentially large time span for repeated transmission of paging messages, radio frames and half-frames may be more suitable for use as the minimum granularity for allocation of paging message time domain resources.
Here, the number of time intervals occupied by the repeated transmission of the paging message having the X-th coverage enhancement level is an integer multiple of the number of time intervals occupied by the repeated transmission of the paging message having the Y-th coverage enhancement level; wherein X and Y are positive integers of 1 or more, and X is less than Y. That is, the number of time intervals occupied by the repeated transmission of the paging message of the larger coverage enhancement level is an integer multiple of the number of time intervals occupied by the repeated transmission of the paging message of the smaller coverage enhancement level. The above features or methods facilitate resource alignment of paging messages of different coverage enhancement levels, thereby facilitating an increase in radio resource utilization efficiency.
Wherein, the coverage enhancement level is also called repetition level, and a higher level indicates a larger coverage enhancement degree required by the paging message.
Step S102: determining N time intervals for repeatedly transmitting the paging message according to the UE identification;
specifically, the method comprises the following steps:
partitioning all time intervals in the range of each paging Cycle size P _ Cycle by taking N continuous time intervals as granularity (namely, each partition comprises N continuous time intervals);
determining one of all time interval blocks according to the UE identification;
the N time intervals for repeated transmission of the paging message are N consecutive time intervals contained in the block. The method can realize that the paging messages of different UEs are repeatedly transmitted in different time interval blocks. The value of the P _ Cycle is obtained by a mode of indicating broadcasted system parameters or UE-specific signaling to the UE, and is an integral multiple of the time interval number occupied by the repeated transmission of the paging message with the maximum coverage enhancement grade. That is, the public P _ Cycle is informed by broadcasted system parameters, but does not exclude the possibility of subsequent P _ Cycle adjustments for a specific UE using UE-specific signaling. Thus, complexity reduction and resource alignment convenience are facilitated.
Specifically, as shown in fig. 2, the determining one of all time interval blocks according to the UE identifier includes:
step S1021: determining a first time interval according to the identity of the UE;
here, the calculation expression for determining the first time interval according to the UE identity is as follows:
TIN_1mod P_Cycle＝N*(UE_ID mod(P_Cycle/N))；
alternatively, TIN _1_ Temp mod P _ Cycle ═ N (UE _ ID mod (P _ Cycle/N)), and TIN _1 ═ TIN _1_ Temp + TIN _ O × N) mod P _ Cycle;
wherein, P _ Cycle represents the size of the paging Cycle, UE _ ID represents the identity of the UE, TIN _1 represents the number of the first time interval, TIN _ O represents the bias of the UE-specific time interval block, the value range is 0 to Q-1, wherein Q is the time interval block number with the size of N included in the P _ Cycle, and TIN _1_ Temp represents the intermediate variable for calculating the TIN _ 1. Here, the TIN _ O may be indicated to the UE through UE-specific Radio Resource Control (RRC) signaling, and the introduction of the TIN _ O further increases flexibility of resource allocation when a paging message is repeatedly transmitted.
Step S1022: determining N consecutive time intervals beginning with the first time interval as time interval blocks of the repeated transmission of the paging message.
Step S103: determining a paging narrow band for repeatedly transmitting the paging message according to the coverage enhancement level;
specifically, the method comprises the following steps:
dividing all coverage classes into K groups, wherein K is a positive integer greater than or equal to 1 and represents the number of narrow bands which can be used for repeatedly transmitting the paging message, and the K different coverage class groups correspond to K different paging narrow bands one by one, wherein the grouping information of all the coverage classes and the paging narrow band information corresponding to different groups are preset or indicated to the UE through broadcasted system parameters;
the paging narrow band used for repeatedly transmitting the paging message is the paging narrow band corresponding to the coverage enhancement level group in which the coverage level is positioned. The method can realize that any paging narrow band for repeatedly transmitting the paging message at least corresponds to one coverage enhancement grade. For example, assuming that the number of narrow bands available for repeated transmission of the paging message is two (K equals 2), and that there are four coverage classes in total, the following may be preset or indicated by broadcasted system parameters: the four coverage classes are divided into two coverage class groups, a first coverage class group comprising first and second coverage classes, a second coverage class group comprising third and fourth coverage classes, the first and second coverage class groups corresponding to first and second paging narrowband, respectively.
Here, the paging narrowband is one of a set of narrowband available for repeatedly transmitting a paging message;
acquiring the narrowband set in a preset mode or in a mode of indicating broadcasted paging system parameters to UE; the narrowband set is independent of or overlaps with a System Information Block (SIB) and Master Information Block (MIB) narrowband set.
Wherein the overlapping includes a full overlap and a partial overlap.
Wherein, when the paging message conflicts with the MIB or SIB1 transmission, the transmission of the paging message is abandoned;
when the paging message collides with the transmission of other SIBs other than SIB1, the transmission of the paging message or the other SIBs is discarded.
Specifically, the set of paging narrow bands includes:
independent of SIB and MIB narrowband sets.
For example, as shown in fig. 3(a), the only one narrowband available for transmission of the paging message, the SIB and the MIB is the single narrowband, and the paging narrowband and the SIB and MIB each use independent narrowbands, without any collision between the three narrowbands, but considering that a small bandwidth scene may not have enough available narrowband number, this approach may not be suitable for a small system bandwidth, such as a case where the system bandwidth takes 3MHz and 1.4 MHz.
Or independent of the MIB narrowband set and overlapping with the SIB narrowband set.
For example, as shown in figure 3(b), the paging message and the SIB employ the same, i.e., two narrowbands that overlap completely and are independent of the central narrowband used for MIB repetition transmission. As shown in fig. 3(c), SIB transmission employs two narrowbands other than the central narrowband, and the paging message employs one of the two narrowbands other than the central narrowband for MIB repetition transmission, where the paging narrowband and the SIB narrowband set are partially overlapped. In this case, when the paging message collides with the transmission of the SIB1, the current transmission of the paging message is abandoned, and when the paging message collides with the transmission of the SIB other than the SIB1, the current transmission of the paging message or the SIB is abandoned; considering the above possibility of abandoning the transmission of paging messages, which may result in a reduction in paging performance or an increase in delay, this approach is not suitable for a small system bandwidth of 1.4 MHz.
Or independent of the SIB narrowband set and overlapping with the MIB narrowband set.
For example, as shown in fig. 3(d), the paging message and the MIB share a unique center narrowband, and two narrowbands other than the center narrowband are used for SIB transmission. As shown in fig. 3(e), the paging message and the MIB share a unique center narrowband, and one of two narrowbands other than the center narrowband is used for SIB transmission. In this case, when the paging message collides with the MIB transmission, the current paging transmission is abandoned; in view of the above-described possibility of forgoing page transmission, paging performance or latency may be incurred. This approach is also not applicable to 1.4MHz system bandwidth and different MIB coverage enhancements may also result in different collision probabilities for paging and MIB transmissions.
Or a unique narrow band shared with the system information block and the system information block.
For example, as shown in fig. 3(f), the narrowband available for transmission of the paging message, the SIB, and the MIB is only one, and the paging message shares a unique central narrowband with the SIB and the MIB, and two narrowbands other than the central narrowband are no longer used for transmission of the SIB and the paging message. In this case, when a paging message collides with the MIB or SIB1 transmission, the transmission of the paging message is abandoned; discarding transmission of the paging message or SIB when the paging message collides with transmission of other SIBs other than SIB 1; in view of the above-described possibility of abandoning the transmission of the paging message, the paging performance may be degraded or the delay may be increased; and coverage enhancements of different MIBs or SIBs may result in different collision probabilities of paging with MIB or SIB transmissions. The only advantage of this approach is that it is applicable to 1.4MHz system bandwidth.
Step S104: repeatedly transmitting the paging message on the determined paging narrowband and available subframes in the determined N time intervals.
Specifically, for a Frequency Division Duplex (FDD) system, the available subframes are subframe 0, subframe 4, subframe 5, and subframe 9, or all available subframes at least including subframe 0, subframe 4, subframe 5, and subframe 9; for a Time Division Duplex (TDD) system, the available subframes are subframe 0, subframe 1, subframe 5, and subframe 6, or all available subframes at least including subframe 0, subframe 1, subframe 5, and subframe 6; wherein, the all available subframes include non-Multicast and Broadcast Single Frequency Network (MBSFN) downlink subframes and MBSFN subframes without Multicast service transmission.
Here, when the available subframes are all available subframes including at least the 4 subframes, the all available subframes are acquired by indicating broadcasted system parameters to the UE; the broadcasted system parameters comprise MBSFN subframe configuration parameters, MBSFN subframe configuration parameters with multicast service transmission and TDD subframe configuration parameters. Specifically, for an FDD system, the all available subframes are subframes other than MBSFN subframes where multicast service transmission exists; for a TDD system, the all available subframes are subframes other than MBSFN subframes and TDD uplink subframes where multicast service transmission exists. For FDD and TDD systems, the non-MBSFN downlink subframes include at least subframe 0/4/5/9 and subframe 0/1/5/6, respectively.
Here, to reduce the paging transmission delay, the largest paging subframe resource should be preferentially adopted for coverage enhanced transmission of the paging message; in particular, considering that subframe 0/4/5/9 is not always configured as an MBSFN subframe for FDD systems and subframe 0/1/5/6 is always not an uplink subframe and is not configured as an MBSFN subframe for TDD systems, the subframes available for transmission of paging messages should at least include subframe 0/4/5/9 and subframe 0/1/5/6 for FDD and TDD systems, respectively.
In addition, if the UE can obtain the subframe configuration parameters of the current cell (for example, the MBSFN subframe configuration parameters with multicast service transmission, the TDD subframe configuration parameters, and the like), other subframes except the 4 subframes may also be used for repeated transmission of the paging message, and finally, all the available subframes may be used for repeated transmission of the paging message. For example, when a UE in Idle (Idle) state enters a new cell, it will usually wake up in advance to receive the system information of the cell (including the subframe configuration parameters of the current cell), only that the specific receiving or waking up time depends on the UE implementation. However, considering that there may be more or less delay from when the UE in an idle state enters a new cell until system information of the cell is acquired, the UE may not receive all paging subframes during the delay. For example, as shown in fig. 4, the subframes of the paging message transmitted by the current cell include subframe 1 and subframe 6 in addition to subframe 0/4/5/9, but since the UE does not timely acquire the subframe configuration information of the current cell at the time of waking up to receive the paging message, it cannot know that subframe 1 and subframe 6 are also used for the paging message transmission, and thus the UE may not receive or utilize the paging message transmitted in subframe 1 and subframe 6. In addition, if different cells with different paging subframe numbers have different paging retransmission durations, the combining process of the corresponding paging retransmission may also be affected. However, if it is envisaged that different cells in an actual network will typically use the same or uniform paging related system parameters and will not change frequently, the above problem may not be serious or need special consideration.
Here, the repeated transmission of the paging message has the following characteristics: 1) occupying all physical resources within a narrowband where paging messages are repeatedly transmitted; 2) the modulation method is four Phase Shift Keying (QPSK); 3) fixed or restricted Transport Block Size (TBS). Wherein, when the restricted TBS is applied, the UE needs to monitor or blindly detect a different TBS when receiving the paging message. It should be noted that although the UE may monitor or blindly detect different TBSs, it is preferable that the UE always monitor or detect a unique coverage enhancement level in consideration of the limitation of the narrowband transmission and the UE buffer size.
In an embodiment, the method further comprises: in the process of repeatedly transmitting the paging message on the determined available subframes in the N time intervals and the determined paging narrow band, if the paging messages with different coverage enhancement levels are transmitted on the determined paging narrow band and conflict occurs, the paging message with one coverage enhancement level is optionally reserved; or, classifying the paging messages of different coverage enhancement classes into a unique paging message having a maximum coverage enhancement class and at least one paging message having a coverage enhancement class different from the maximum coverage enhancement class; combining the at least one paging message having a coverage enhancement level different from the maximum coverage enhancement level with the unique paging message having the maximum coverage enhancement level to obtain a combined paging message; and then transmitting the synthesized paging message in N time intervals corresponding to the only paging message with the maximum coverage enhancement grade.
In addition, it should be added that, when the paging message is scheduled across subframes through Downlink Control Information (DCI), the DCI data may use the transmission mode of the paging message; the DCI data is carried in an Enhanced downlink control channel (EPDCCH). For example, if the cross-subframe scheduling mode of DCI is implemented, the number of time intervals occupied by the repeated transmission of the paging message in the coverage enhancement level is equal to the number of time intervals occupied by the repeated transmission of the DCI in the coverage enhancement level, and the narrowband for the repeated transmission of the paging message is equal to the EPDCCH narrowband for the repeated transmission of DCI data. For FDD systems, if subframe 0/4/5/9 is used for repeated transmission of paging messages, repeated transmission equivalent to DCI must also be limited to the extent of subframe 0/4/5/9.
Further, the manner of repeatedly transmitting the paging message may be a narrowband frequency hopping manner. Specifically, in the narrowband frequency hopping mode, the narrowband frequency hopping mode needs to be started, and the frequency hopping interval is equal to M time intervals. Wherein, M is a natural number greater than or equal to 1, and the number N of time intervals occupied by the repeated transmission of the paging message under any coverage enhancement level is integral multiple of M; the hopping interval is preset or indicated to the UE by broadcasted system parameters. In practical applications, regardless of the situation of the subframes available for the repeated transmission of the paging message in the time interval, the repeated transmission of the paging message in different coverage enhancement classes usually always occupies N time intervals, so it should be preferable to define the frequency hopping interval for the repeated transmission of the paging message always to be M time intervals.
In an embodiment, when the manner of repeatedly transmitting the paging message is a narrowband frequency hopping manner, the method further includes: for an FDD system, when the narrowband frequency hopping mode is on, if the available subframes are subframe 0, subframe 4, subframe 5, and subframe 9, a new frame timing corresponding to the paging message is determined. For example, as shown in fig. 5, the new radio frame subframe 0 corresponds to the existing radio frame subframe 4, and there is an offset of 3 subframes between the new radio frame and the existing radio frame timing. In this way, when a jump (recovery) for different narrowband transmissions occurs at a radio frame, or half-frame boundary, the duration of three subframes may be used for the recovery operation to ensure sufficient recovery time.
In an embodiment, when the manner of repeatedly transmitting the paging message is a frequency hopping manner, the method further includes: when the narrowband frequency hopping mode is started, if the paging message and the broadcast and/or unicast data except the paging message adopt the overlapped narrowband set, the paging message is repeatedly transmitted in a mode that the paging message and the broadcast and/or unicast data except the paging message share the frequency hopping interval. Therefore, the resource alignment can be further ensured, and the resource utilization efficiency is favorably improved.
Within the frequency hopping interval, multi-subframe channel estimation at the UE side can be applied to improve channel estimation performance even if not all subframes within the frequency hopping interval are used for paging message transmission.
It should be noted that, unless otherwise specified, the paging narrowband according to the embodiment of the present invention is a physical narrowband. Wherein, in case of turning on a narrowband frequency hopping function for repeatedly transmitting the paging message, the paging message may be transmitted in the same or different physical narrowband for different time intervals.
Therefore, the data transmission method of the embodiment of the invention can greatly reduce the transmission delay of the paging message and avoid the long-time occupation of the radio resources by the repeatedly transmitted paging message, thereby improving the cooperative scheduling capability of the radio resources and reducing the influence on the normal transmission of other broadcast and/or unicast data.
Please revise the device portion based on the revised methods portion.
Fig. 6 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention, and as shown in fig. 6, the apparatus includes an obtaining module 601, a determining module 602, and a transmitting module 603;
the acquiring module 601 is configured to acquire a time interval number N occupied by repeated transmission of the paging message in the coverage enhancement level; wherein N is a positive integer greater than or equal to 2.
Specifically, the obtaining module 601 obtains the number N of time intervals occupied by the repeated transmission of the paging message in the coverage enhancement level in a manner of indicating the broadcasted paging system parameter to the UE; or implicitly determining the number N of time intervals occupied by repeated transmission of the paging message under the coverage enhancement level according to the available subframes;
the determining module 602 specifically partitions all time intervals within the range of each paging Cycle size P _ Cycle by taking N time intervals as granularity; determining one of all time interval blocks according to the UE identification; the N time intervals for repeatedly transmitting the paging message are N continuous time intervals contained in the block; the Paging Cycle value is indicated by a broadcasted system parameter or UE (user equipment) proprietary signaling and is an integral multiple of the time interval number occupied by the repeated transmission of the Paging message with the maximum coverage enhancement level.
Here, the determining module 602 is configured to determine one of all time interval blocks according to the UE identity, and includes:
determining a first time interval according to the coverage enhancement level and the identity of the UE; determining N consecutive time intervals beginning with the first time interval as time interval blocks of the repeated transmission of the paging message.
The transmitting module 603 is configured to repeatedly transmit the paging message on the determined available subframes in the N time intervals and the determined paging narrowband;
in an application example, as shown in fig. 6, the transmission module 603 is further configured to, if a collision occurs when paging messages with different coverage enhancement levels are transmitted on the determined paging narrowband, arbitrarily retain the paging message with one of the coverage enhancement levels; or, classifying the paging messages of different coverage enhancement classes into a unique paging message having a maximum coverage enhancement class and at least one paging message having a coverage enhancement class different from the maximum coverage enhancement class; combining the at least one paging message having a coverage enhancement level different from the maximum coverage enhancement level with the unique paging message having the maximum coverage enhancement level to obtain a combined paging message; and then transmitting the synthesized paging message in N time intervals corresponding to the only paging message with the maximum coverage enhancement grade.
Here, the manner used by the transmission module 603 to repeatedly transmit the paging message may be a narrowband frequency hopping manner.
In an application example, as shown in fig. 6, the determining module 602 is further configured to determine, for an FDD system, when the narrowband frequency hopping mode is turned on, if the available subframes are subframe 0, subframe 4, subframe 5, and subframe 9, a new frame timing corresponding to the paging message.
In an application example, as shown in fig. 6, the transmitting module 603 is further configured to, when the narrowband frequency hopping mode is turned on, if the paging message and the broadcast and/or unicast data except for the paging message adopt overlapping narrowband sets, repeatedly transmit the paging message in a manner that the paging message and the broadcast and/or unicast data except for the paging message share a frequency hopping interval.
Each module in the device of the embodiment of the invention can be realized by a processor in the device, and also can be realized by a specific logic circuit; for example, in practical applications, the device may be implemented by a Central Processing Unit (CPU), a Microprocessor (MPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or the like.
The data transmission method according to the embodiment of the present invention is further described in detail below with reference to specific application examples.
Fig. 7 is a diagram illustrating an exemplary application of the present invention for determining a paging message retransmission resource according to a coverage enhancement level and a UE identity; wherein the paging message repetition transmission resource comprises N time intervals and a paging narrowband for repeating transmission of the paging message.
As shown in fig. 7, the narrow band for paging message repeat transmission includes two, i.e. a 1 st narrow band and a 2 nd narrow band, and the number of coverage enhancement levels is 4, wherein the 1 st narrow band is used for transmission of 1 st and 2 nd coverage enhancement level paging messages, and the 2 nd narrow band is used for transmission of 3 rd and 4 th coverage enhancement level paging messages.
For the 1 st narrowband and the 1 st coverage enhancement level, all time intervals within each paging Cycle size P _ Cycle are partitioned with granularity of N1 (the number of time intervals occupied by paging messages repeatedly transmitted under the 1 st coverage enhancement level) time intervals (each partition includes N1 time intervals), and the final number of time interval blocks is 16, wherein the 7 th block is used for transmitting paging messages to the UE1 in the 1 st coverage enhancement level, and the 8 th block is used for transmitting paging messages to the UE2 in the 1 st coverage enhancement level.
For the 1 st narrowband and the 2 nd coverage enhancement level, all time intervals within each paging Cycle size P _ Cycle are partitioned with granularity of N2 (the number of time intervals occupied by paging messages repeatedly transmitted under the 2 nd coverage enhancement level) time intervals (each partition includes N2 time intervals), and the final number of time interval blocks is 8, wherein the 3 rd partition is used for transmitting paging messages to the UE3 in the 2 nd coverage enhancement level, and the 6 th partition is used for transmitting paging messages to the UE4 in the 2 nd coverage enhancement level.
For the 2 nd narrowband and the 3 rd coverage enhancement level, all time intervals within each paging Cycle size P _ Cycle are partitioned with granularity of N3 (the number of time intervals occupied by paging messages repeatedly transmitted under the 3 rd coverage enhancement level) time intervals (each partition includes N3 time intervals), and the final number of time interval blocks is 4, wherein the 1 st block is used for transmitting paging messages to the UE5 in the 3 rd coverage enhancement level.
For the 2 nd narrowband and the 4 th coverage enhancement level, all time intervals within each paging Cycle size P _ Cycle are partitioned with granularity of N4 (the number of time intervals occupied by paging messages repeatedly transmitted under the 4 th coverage enhancement level) time intervals (each partition includes N4 time intervals), and the final number of time interval blocks is 2, wherein the 2 nd partition is used for transmitting the paging messages to the UE6 in the 4 th coverage enhancement level.
Fig. 8 is a diagram illustrating an exemplary application of the present invention to sharing a hop interval with a paging message and unicast data.
As shown in fig. 8, the narrowband for paging message repeat transmission corresponds to two physical narrowbands, that is, the 1 st physical narrowband and the 2 nd physical narrowband, the narrowband for unicast data repeat transmission corresponds to two physical narrowbands that are the same as the paging message, the frequency hopping intervals of the paging message and the unicast data are the same, and the specific frequency hopping interval size is M time intervals. In the first M time intervals, the repeatedly transmitted paging message occupies the 1 st physical narrow band, the repeatedly transmitted unicast data occupies the 2 nd physical narrow band, in the second M time intervals, the repeatedly transmitted paging message occupies the 2 nd physical narrow band, the repeatedly transmitted unicast data occupies the 1 st physical narrow band, and so on.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (24)
1. A method of data transmission, the method comprising:
acquiring the number N of time intervals occupied by repeated transmission of paging messages under the coverage enhancement level;
determining N time intervals for repeatedly transmitting the paging message according to the UE identification of the user equipment;
determining a paging narrow band for repeatedly transmitting the paging message according to the coverage enhancement level;
repeatedly transmitting the paging message on the determined paging narrowband and available subframes in the determined N time intervals;
wherein N is a positive integer greater than or equal to 2.
2. The method of claim 1,
for a frequency division duplex FDD system,
the available subframes are subframe 0, subframe 4, subframe 5 and subframe 9, or all available subframes at least including subframe 0, subframe 4, subframe 5 and subframe 9;
for a time division duplex TDD system,
the available subframes are subframe 0, subframe 1, subframe 5 and subframe 6, or all available subframes at least including subframe 0, subframe 1, subframe 5 and subframe 6;
wherein, the all the available subframes comprise non-multicast and broadcast single frequency network MBSFN downlink subframes and MBSFN subframes without multicast service transmission.
3. The method of claim 1, wherein obtaining the number N of time intervals occupied by the repeated transmission of the paging message in the coverage enhancement level comprises:
acquiring the number N of time intervals occupied by repeated transmission of paging messages under the coverage enhancement level by indicating the broadcasted paging system parameters to the UE; or implicitly determining the number N of time intervals occupied by the repeated transmission of the paging message under the coverage enhancement level according to the available subframes.
4. The method of claim 1, wherein the determining N time intervals for repeated transmission of the paging message according to the UE identity comprises:
all time intervals in the range of each paging Cycle size P _ Cycle are partitioned by taking N continuous time intervals as granularity;
determining one of all time interval blocks according to the UE identification;
the N time intervals for repeatedly transmitting the paging message are N continuous time intervals contained in the block; the value of the P _ Cycle is obtained by a mode of indicating broadcasted system parameters or UE-specific signaling to the UE, and is an integral multiple of the time interval number occupied by the repeated transmission of the paging message with the maximum coverage enhancement grade.
5. The method of claim 4, wherein the determining one of all time interval blocks according to the UE identity comprises:
determining a first time interval according to the identity of the UE;
determining N consecutive time intervals beginning with the first time interval as time interval blocks of the repeated transmission of the paging message.
6. The method of claim 5, wherein the calculation for determining the first time interval according to the UE identity is as follows:
TIN_1mod P_Cycle＝N*(UE_ID mod(P_Cycle/N))；
alternatively, TIN _1_ Temp mod P _ Cycle ═ N (UE _ ID mod (P _ Cycle/N)), and TIN _1 ═ TIN _1_ Temp + TIN _ O × N) mod P _ Cycle;
wherein, P _ Cycle represents the size of the paging Cycle, UE _ ID represents the identity of the UE, TIN _1 represents the number of the first time interval, TIN _ O represents the bias of UE-specific time interval blocking, and TIN _1_ Temp represents an intermediate variable for calculating the TIN _ 1.
7. The method of any of claims 1 to 4, wherein during the repeated transmission of the paging message on the determined available subframes in the N time intervals and the determined paging narrowband, the method further comprises:
if conflict occurs when paging messages with different coverage enhancement grades are transmitted on the determined paging narrow band, the paging message with one coverage enhancement grade is randomly reserved;
or, classifying the paging messages of different coverage enhancement classes into a unique paging message having a maximum coverage enhancement class and at least one paging message having a coverage enhancement class different from the maximum coverage enhancement class; combining the at least one paging message having a coverage enhancement level different from the maximum coverage enhancement level with the unique paging message having the maximum coverage enhancement level to obtain a combined paging message; and then transmitting the synthesized paging message in N time intervals corresponding to the only paging message with the maximum coverage enhancement grade.
8. The method according to any one of claims 1 to 4,
the paging narrowband is one of a set of narrowband available for repeated transmission of paging messages;
acquiring the narrowband set in a preset mode or in a mode of indicating broadcasted paging system parameters to UE; the narrowband set is independent of or overlaps with the system information block SIB and master information block MIB narrowband sets.
9. The method of claim 8,
discarding the paging message transmission when a paging message collides with the MIB or SIB1 transmission;
when the paging message collides with the transmission of other SIBs other than SIB1, the transmission of the paging message or the other SIBs is discarded.
10. The method according to any of claims 1 to 4, wherein the repeated transmission of the paging message is a narrowband frequency hopping.
11. The method of claim 10, further comprising:
for an FDD system, when the narrowband frequency hopping mode is on, if the available subframes are subframe 0, subframe 4, subframe 5, and subframe 9, a new frame timing corresponding to the paging message is determined.
12. The method of claim 10, further comprising:
when the narrowband frequency hopping mode is started, if the paging message and the broadcast and/or unicast data except the paging message adopt the overlapped narrowband set, the paging message is repeatedly transmitted in a mode that the paging message and the broadcast and/or unicast data except the paging message share the frequency hopping interval.
13. The method of claim 10,
when the narrowband frequency hopping mode is started, the frequency hopping interval is equal to M time intervals;
wherein, M is a natural number greater than or equal to 1, and the number N of time intervals occupied by the repeated transmission of the paging message under any coverage enhancement level is integral multiple of M; the hopping interval is preset or indicated to the UE by broadcasted system parameters.
14. The method according to any of claims 1 to 4, characterized in that the number of time intervals occupied by the repeated transmission of paging messages with the Xth coverage enhancement level is an integer multiple of the number of time intervals occupied by the repeated transmission of paging messages with the Yth coverage enhancement level; wherein X and Y are positive integers of 1 or more, and X is less than Y.
15. The method of claim 2, further comprising:
when the available subframes are all available subframes at least containing the 4 subframes, acquiring all the available subframes by broadcasting system parameter indication to a UE;
the broadcasted system parameters comprise MBSFN subframe configuration parameters, MBSFN subframe configuration parameters with multicast service transmission and TDD subframe configuration parameters.
16. The method according to any of claims 1 to 4, wherein said process of repeatedly transmitting said paging message has the following characteristics: all physical resources in the paging narrowband are occupied, and the modulation mode is four-phase shift keying QPSK and fixed or limited transport block size TBS.
17. A data transmission apparatus, characterized in that the apparatus comprises: the device comprises an acquisition module, a determination module and a transmission module;
the acquisition module is used for acquiring the number N of time intervals occupied by the repeated transmission of the paging message under the coverage enhancement level;
the determining module is configured to determine, according to a UE identity, N time intervals for repeatedly transmitting the paging message; determining a paging narrow band for repeatedly transmitting the paging message according to the coverage enhancement level;
the transmission module is configured to repeatedly transmit the paging message on the determined available subframes in the N time intervals and the determined paging narrowband;
wherein N is a positive integer greater than or equal to 2.
18. The apparatus of claim 17,
the acquiring module is specifically configured to acquire the number N of time intervals occupied by repeated transmission of the paging message at the coverage enhancement level in a manner of indicating the broadcasted paging system parameter to the UE; or implicitly determining the number N of time intervals occupied by the repeated transmission of the paging message under the coverage enhancement level according to the available subframes.
19. The apparatus of claim 17,
the determining module is specifically configured to block all time intervals within a range of each paging Cycle size P _ Cycle by taking N time intervals as granularity; determining one of all time interval blocks according to the UE identification; the N time intervals for repeatedly transmitting the paging message are N continuous time intervals contained in the block; the value of the P _ Cycle is indicated by a broadcasted system parameter or a UE-specific signaling, and is an integer multiple of a time interval number occupied by the repeated transmission of the paging message of the maximum coverage enhancement level.
20. The apparatus of claim 19,
the determining module is specifically configured to determine a first time interval according to the UE identifier; determining N consecutive time intervals beginning with the first time interval as time interval blocks of the repeated transmission of the paging message.
21. The apparatus of any one of claims 17 to 19,
the transmission module is further configured to, if a collision occurs when paging messages with different coverage enhancement levels are transmitted on the determined paging narrowband, arbitrarily reserve a paging message with one of the coverage enhancement levels; or, classifying the paging messages of different coverage enhancement classes into a unique paging message having a maximum coverage enhancement class and at least one paging message having a coverage enhancement class different from the maximum coverage enhancement class; combining the at least one paging message having a coverage enhancement level different from the maximum coverage enhancement level with the unique paging message having the maximum coverage enhancement level to obtain a combined paging message; and then transmitting the synthesized paging message in N time intervals corresponding to the only paging message with the maximum coverage enhancement grade.
22. The apparatus according to any of claims 17 to 19, wherein the means for repeatedly transmitting the paging message is a narrowband frequency hopping.
23. The apparatus of claim 22,
the determining module is further configured to determine, for an FDD system, when the narrowband frequency hopping mode is turned on, a new frame timing corresponding to the paging message if the available subframes are subframe 0, subframe 4, subframe 5, and subframe 9.
24. The apparatus of claim 22,
the transmission module is further configured to, when the narrowband frequency hopping mode is turned on, if the paging message and the broadcast and/or unicast data except the paging message adopt an overlapped narrowband set, repeatedly transmit the paging message in a manner that the paging message and the broadcast and/or unicast data except the paging message share a frequency hopping interval.
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