CN107197525B - Method and device for improving MBMS capacity - Google Patents

Method and device for improving MBMS capacity Download PDF

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CN107197525B
CN107197525B CN201710252760.5A CN201710252760A CN107197525B CN 107197525 B CN107197525 B CN 107197525B CN 201710252760 A CN201710252760 A CN 201710252760A CN 107197525 B CN107197525 B CN 107197525B
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subframe
configuration
mbsfn
signal
unicast
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CN107197525A (en
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李继龙
任仪
冯海亮
夏勇
张帆
何晶
王晓霞
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Academy of Broadcasting Science of SAPPRFT
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • 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
    • H04L5/0001—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
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • 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
    • 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
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services

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  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a method and a device for improving MBMS capacity. The method comprises the following steps: s101, configuring a special subframe for transmitting a synchronization signal and/or a measurement signal in a wireless subframe; the dedicated subframe is one of: a unicast subframe, an MBSFN subframe containing a unicast part and an MBSFN subframe with a pre-configured synchronization signal sequence; and S102, sending a downlink synchronous signal or a channel on the special subframe according to the pre-configured configuration information. The method and the device realize the sending of the synchronizing signal and/or the measuring signal in the MBSFN scene by improving the configuration of the frame structure, thereby effectively solving the problems of downlink synchronization and measurement in the MBSFN scene and further improving the capacity of the MBMS system.

Description

Method and device for improving MBMS capacity
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for increasing MBMS capacity.
Background
A Multicast-Multicast Single Frequency Network (MBSFN) requires that identical waveforms transmitted from multiple cells are received at the same time, and a UE (User Equipment) receiver can regard multiple MBSFN cells as one large cell. Furthermore, the UE will not only not suffer from inter-cell interference of neighboring cell transmissions, but will also benefit from superposition of signals from multiple MBSFN cells. Furthermore, advanced UE receiver techniques such as G-RAKE can also solve the time difference problem of multipath propagation, thereby eliminating intra-cell interference.
MBSFN is divided into two categories: MBSFN for dedicated carriers and MBSFN for mixed carriers with Unicast (Unicast). Currently, the LTE (Long Term Evolution) mainly implements a mixed carrier MBSFN. The 1 st and 2 nd symbols in the MBSFN subframe of the mixed carrier adopt a normal CP (Cyclic Prefix), reserve a unicast pilot frequency, and can be used for transmission of channels such as a PDCCH (Physical Downlink Control Channel), a PCFICH (Physical Control Format Indicator Channel), and a PHICH (Physical Hybrid ARQ Indicator Channel). Other symbols in the subframe are used for MBSFN signal transmission. In addition to the MBSFN mode of sharing a Carrier with unicast signals, another MBSFN mode is Dedicated-Carrier (DC) MBSFN, which is suitable for exclusive Carrier deployment and does not need to be multiplexed with unicast signals. LTE DC MBSFN employs 7.5kHz subcarrier spacing, so the symbol length is twice that of the 15kHz subcarrier spacing system. The LTE specification does not fully implement a 7.5kHz subcarrier spacing (no signaling is defined to indicate the use of this mode and therefore cannot be implemented), at least to Rel-10 release, LTE only fully supports a 15kHz subcarrier spacing, i.e., the MBSFN mode with unicast mixed carriers described above.
In existing LTE protocols, only subframe 1/2/3/6/7/8 (for FDD (frequency division duplex)), or subframe 3/4/7/8/9 (for TDD (time division duplex)) may be configured as MBSFN subframes in each radio frame. But in some scenarios more subframes need to be configured as MBSFN subframes. For example, an eMBMS (enhanced Multimedia Broadcast Multicast Service) Service is carried by using an sdl (supplemental downlink carrier) carrier. To avoid wasting uplink capacity in FDD UL/DL carriers, all eMBMS services should be sent as centrally as possible on some SDL carriers. In addition, the MBSFN subframe may not have a unicast part and CRS, and is used to transmit the MBMS service.
If either subframe 0/4/5/9 or subframe 0/1/5/6 can be configured as MBSFN subframes, or if MBSFN subframes have no unicast parts, there may be problems with how UEs synchronize and/or measure. These problems affect both the reception of MBMS services by the UE and the cell switching of the UE. Therefore, it is necessary to design a solution to solve the above problem, so as to increase the capacity of MBMS (Multimedia Broadcast Multicast Service).
Disclosure of Invention
In order to overcome the above-mentioned drawbacks of the prior art, the present invention provides a method and an apparatus for increasing MBMS capacity, so as to increase the MBMS capacity.
In order to solve the above technical problem, a method for increasing MBMS capacity in the present invention is used for a base station, and the method includes:
configuring a dedicated subframe for transmitting a synchronization signal and/or a measurement signal in a radio subframe; the dedicated subframe is one of: a unicast subframe, an MBSFN subframe containing a unicast part and an MBSFN subframe with a pre-configured synchronization signal sequence;
and sending a downlink synchronous signal or a channel on the special subframe according to the pre-configured configuration information.
Optionally, the synchronization signal and/or the measurement signal comprises one of: a discovery signal, a cell reference signal, a primary synchronization signal/secondary synchronization signal, a CSI pilot frequency, a downlink UE special pilot frequency, a downlink control channel and a pre-configured synchronization signal sequence;
before the sending the downlink signal or channel on the dedicated subframe according to the pre-configured configuration information, the method further includes:
sending the pre-configured configuration information of the special subframe to a user terminal; the configuration information includes a transmit configuration and a measurement configuration.
Optionally, configuring a dedicated subframe for transmitting a synchronization signal and/or a measurement signal in a radio subframe; transmitting a downlink signal or a channel on the dedicated subframe according to the pre-configured configuration information, comprising:
configuring the dedicated subframe in a radio subframe if a subcarrier interval is 15 kHz; sending a downlink signal or a channel on the special subframe according to the pre-configured configuration information;
configuring the unicast subframe in a wireless subframe if the subcarrier spacing is not 15 kHz; sending a downlink signal or a channel on the unicast subframe according to configuration information;
if the downlink signal or the channel is a discovery signal, configuring the unicast subframe in a wireless subframe; and sending a downlink signal or a channel on the unicast subframe according to the configuration information.
Optionally, the configuring, in the radio subframe, a dedicated subframe for transmitting a synchronization signal and/or a measurement signal specifically includes:
configuring radio subframe 0 and/or radio subframe 5 as the dedicated subframe.
Specifically, if the dedicated subframe is an MBSFN subframe including a preconfigured synchronization signal sequence; before the sending the downlink synchronization signal or the channel on the dedicated subframe according to the pre-configured configuration information, the method further includes:
and configuring a synchronization signal sequence for each MBSFN cell according to the MBSFN area identifier of each MBSFN cell.
In order to solve the above technical problem, an apparatus for increasing MBMS capacity in the present invention is used for a base station, and the apparatus includes:
a configuration module for configuring a dedicated subframe for transmitting a synchronization signal and/or a measurement signal in a radio subframe; the special subframe is one of a unicast subframe, an MBSFN subframe containing a unicast part and an MBSFN subframe with a pre-configured synchronization signal sequence;
and the sending module is used for sending the downlink synchronous signal or the channel on the special subframe according to the pre-configured configuration information.
Optionally, the synchronization signal and/or the measurement signal comprises one of: a discovery signal, a cell reference signal, a primary synchronization signal/secondary synchronization signal, a CSI pilot frequency, a downlink UE special pilot frequency, a downlink control channel and a pre-configured synchronization signal sequence;
the sending module is further configured to send the pre-configured configuration information of the dedicated subframe to the user terminal; the configuration information includes a transmit configuration and a measurement configuration.
Optionally, the apparatus further comprises a determining module;
the judging module is used for triggering the configuration module to configure the special subframe in a wireless subframe if the subcarrier interval is 15 kHz;
triggering the configuration module to configure the unicast subframe in a wireless subframe if the subcarrier spacing is not 15 kHz; the sending module sends a downlink signal or a channel on the unicast subframe according to the configuration information;
if the downlink signal or the channel is a discovery signal, triggering the configuration module to configure the unicast subframe in a wireless subframe; and the sending module sends a downlink signal or a channel on the unicast subframe according to the configuration information.
Optionally, the configuration module is specifically configured to configure radio subframe 0 and/or radio subframe 5 as the dedicated subframe.
Specifically, if the dedicated subframe is an MBSFN subframe including a preconfigured synchronization signal sequence; the device further comprises:
and the synchronizing signal sequence generating module is used for configuring a synchronizing signal sequence for each MBSFN cell according to the MBSFN area identifier of each MBSFN cell.
The invention has the following beneficial effects:
the method and the device realize the sending of the synchronizing signal and/or the measuring signal in the MBSFN scene by improving the configuration of the frame structure, thereby effectively solving the problems of downlink synchronization and measurement in the MBSFN scene, improving the capacity of the MBMS system, being particularly suitable for the Standalone scene and the scene in which the subframe 0/5 is configured as the MBSFN subframe, improving the effect of the MBMS capacity, and simultaneously ensuring the synchronous transmission and measurement of the signals.
Drawings
Fig. 1 is a flowchart illustrating a method for enhancing MBMS capacity according to an embodiment of the present invention;
FIG. 2 is a diagram of an MBSFN frame structure of a mixed carrier with unicast in the embodiment of the present invention;
FIG. 3 is a frame structure diagram of an MBSFN subframe including a unicast part in the embodiment of the present invention;
fig. 4 is a schematic structural diagram of an apparatus for increasing MBMS capacity according to an embodiment of the present invention.
Detailed Description
In order to solve the problems in the prior art, the present invention provides a method and an apparatus for increasing MBMS capacity, and the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
As shown in fig. 1, a method for increasing MBMS capacity in an embodiment of the present invention is applied to a base station, and the method includes:
s101, configuring a special subframe for transmitting a synchronization signal and/or a measurement signal in a wireless subframe; the dedicated subframe is one of: a unicast subframe, an MBSFN subframe containing a unicast part and an MBSFN subframe with a pre-configured synchronization signal sequence;
and S102, sending a downlink synchronous signal or a channel on the special subframe according to the pre-configured configuration information.
The embodiment of the invention realizes the sending of the synchronizing signal and/or the measuring signal in the MBSFN scene by improving the configuration of the frame structure, thereby effectively solving the problems of downlink synchronization and measurement in the MBSFN scene, improving the capacity of the MBMS system, being particularly suitable for the Standalone scene and the scene in which the subframe 0/5 is configured as the MBSFN subframe, improving the effect of the MBMS capacity and simultaneously ensuring the synchronous transmission and measurement of the signals.
The embodiments of the present invention are described in detail below with specific examples.
The invention achieves the purpose of improving the MBMS capacity mainly by realizing the transmission of the synchronous signals and/or the measurement signals in the MBSFN scene, and can comprise the following steps in the realization:
step 1, a base station configures a special subframe for transmitting a synchronization signal and/or a measurement signal in a wireless subframe; the method comprises the steps of sending the configuration of a dedicated unicast subframe, and/or a unicast part which is sent by the same subframe with the MBSFN part, and/or the configuration of an MBSFN subframe containing the unicast part, and/or the configuration of an MBSFN subframe containing a new synchronization signal sequence (a pre-configured synchronization signal sequence) to the UE.
The above-mentioned specific and exclusive meanings are the same.
That is to say, before the sending the downlink signal or channel on the dedicated subframe according to the pre-configured configuration information, the method may further include:
sending the pre-configured configuration information of the special subframe to a user terminal; the configuration information includes a transmit configuration and a measurement configuration.
Specifically, the specific unicast subframe or unicast part is mainly used for transmitting DRS (Discovery Reference Signal), and/or CRS (Cell Reference Signal), and/or PSS (Primary Synchronization Signal)/SSS (Secondary Synchronization Signal), and/or CSI-RS (CSI pilot), and/or downlink UE-specific RS (UE-specific pilot), and/or downlink control channel, and/or newly defined or modified downlink Signal (i.e. preconfigured Synchronization Signal sequence), for downlink Synchronization, Cell Discovery, measurement or demodulation functions, and/or for supporting uplink transmission functions (such as uplink scheduling grant, HARQ acknowledgement and TPC). The necessary downlink signals or channels transmitted by the specific unicast subframe or unicast portion do not include PDSCH. But does not exclude the case where PDSCH is transmitted multiplexed with subframes.
Each subframe (i.e., radio subframe) of a conventional hybrid MBSFN subframe includes a unicast portion and an MBSFN portion. Conventional dedicated MBSFN subframes do not include a unicast portion per subframe. In the invention, the specific unicast subframe or the MBSFN subframe comprising the unicast part is regularly transmitted according to the configuration and is used for the functions of synchronization, measurement and the like. A specific unicast subframe or MBSFN subframe including a unicast portion is not limited to being configured only in subframe 0 or subframe 5. And the invention is not limited to whether other subframes are configured as hybrid MBSFN subframes, or dedicated MBSFN subframes, or unicast subframes, and how they are configured.
The MBSFN subframe including the new or modified downlink signal may be a dedicated MBSFN subframe or a mixed MBSFN subframe including a unicast part.
The specific unicast subframe, and/or unicast portion, and/or configuration information including MBSFN subframes may include a transmission configuration and/or a measurement configuration. The transmit configuration and the measurement configuration may be the same or a subset relationship, e.g., the measurement configuration may be a subset of the transmit configuration.
The sending configuration mainly comprises at least one of the following steps: a transmission period, a transmission offset, a transmission duration, a duration of the unicast part in a subframe, or a symbol number.
The measurement configuration mainly comprises at least one of the following: measurement period, measurement offset, measurement duration, duration of unicast part in subframe or number of symbols.
The configuration information may also include a transmission period and/or offset of the signal, etc. When the transmission period or offset of the signal is known to the base station or the UE, the base station is not required to transmit the signal to the UE.
When the configuration of the specific unicast subframe, and/or unicast part, and/or MBSFN subframe is agreed by both sides of the base station and the UE, or a value defined by a protocol (both the base station and the UE know), the base station is not required to notify the UE. For example, if the synchronization signal is transmitted once every 5ms, and the base station and the UE know the transmission configuration of the synchronization signal in subframe 0 and subframe 5, respectively, then the base station does not need to transmit the UE with such configuration information.
And the base station sends the configuration information to the UE through RRC signaling or downlink control signaling DCI. Preferably, the base station sends the information to the UE through RRC signaling.
The base station may also transmit the unicast subframe and/or the MBSFN subframe including the unicast part by using the configuration of DRS or dmtc (DRS Measurement Timing configuration). The configuration of the DRS includes a duration of the DRS, and the configuration of the DMTC includes at least one of: period, offset and measurement duration.
For example, a transmission subframe of DRS or a DMTC subframe is configured as a unicast subframe, and the signal is transmitted on the DRS subframe or the DMTC subframe. At this time, the transmission or measurement configuration of the specific unicast subframe is equal to a DRS subframe configuration or a DMTC subframe configuration.
Whether all downlink subframes in the radio frame are configured to be special MBSFN subframes or other subframe types or a part of downlink subframes in the radio frame are configured to be special MBSFN subframes or other subframe types or not, the specific unicast subframe or unicast part is transmitted according to the configuration. At this time, the subframe in which the specific unicast subframe or unicast part is located is not sent according to other subframe types.
For example, all downlink subframes are configured as dedicated MBSFN subframes, including subframe 0, subframe 1, subframe 2, …. And the specific unicast subframe or unicast part is configured in the subframe 0, the subframe 40, the subframe 80, …, and when actually transmitting, the specific unicast subframe or unicast part is configured to be transmitted in the subframe 0, the subframe 40, the subframe 80, …, but not in the dedicated MBSFN subframe configuration.
Alternatively, when a subframe is configured as a specific unicast subframe, or a specific MBSFN subframe containing a unicast portion, the subframe can no longer be configured as a dedicated MBSFN subframe, and/or a mixed MBSFN subframe, and/or other types of subframes.
Further, when a subframe is configured as a specific unicast subframe, the subframe cannot be configured as a dedicated MBSFN subframe and a mixed MBSFN subframe; when a certain subframe is configured as a specific MBSFN subframe containing a unicast part, the subframe can not be configured as a special MBSFN subframe or a non-specific mixed MBSFN subframe any more;
and step 2, sending a downlink synchronous signal or a channel on the special subframe according to the pre-configured configuration information. That is, the base station transmits the downlink signal or channel according to the configuration in the specific unicast subframe, and/or the unicast part transmitted in the same subframe as the MBSFN part, and/or the MBSFN subframe containing the unicast part, and/or the MBSFN subframe containing the new or modified downlink signal.
The downlink signal or channel transmitted by the specific unicast subframe or unicast part or MBSFN subframe mainly comprises: the base station comprises a DRS, and/or a CRS, and/or a PSS/SSS, and/or a CSI-RS, and/or a downlink UE-specific RS, and/or a downlink control channel, and/or a newly defined or modified downlink signal, and is used for downlink synchronization, cell discovery, measurement or demodulation functions, and/or supporting an uplink transmission function.
The necessary downlink signals or channels transmitted by the specific unicast subframe or unicast portion do not include PDSCH. But does not exclude the case where PDSCH may or may not be transmitted with subframe multiplexing.
The configuration may be a transmit configuration or a measurement configuration. The sending configuration may be the same as the measuring configuration or a subset relationship. The specific implementation can be explained with reference to step 1 above.
Whether all downlink subframes in a radio frame are configured as MBSFN subframe types or part of downlink subframes are configured as MBSFN subframes or other subframe types, the unicast subframe or the unicast part is transmitted according to the configuration.
For example, the transmission period of the unicast subframe or unicast section is 40/80/160ms, the transmission offset is 0ms to (period-1) ms (here, assumed to be 0ms offset), and the transmission duration is 1-6 ms. Here, it is assumed that the transmission cycle is 40ms, the transmission offset is 0ms, and the transmission duration is 1 ms.
And if the configured unicast subframe or the unicast part is the unicast subframe, the signal or the channel is transmitted in the unicast subframe configured at 0-1 ms, 40-41 ms, 80-81 ms and … ms, and whether all downlink subframes in the radio frame are configured as MBSFN subframes or other subframes. As shown in fig. 3.
If the configured unicast subframe or unicast part is the MBSFN subframe comprising the unicast part, the signal or the channel is transmitted in the MBSFN subframe configured to comprise the unicast part in 0-1 ms, 40-41, 80-81, …, no matter whether all downlink subframes in the radio frame are configured to be special or mixed MBSFN subframes or other subframe types. As shown in fig. 3; or when the unicast sub-frame is 0-1 ms, 40-41, 80-81, …, the signal or the channel is sent according to the unicast sub-frame. When the signal or the channel is an MBSFN subframe, the MBSFN subframe is configured to include a unicast part, and the MBSFN subframe is 0-1 ms, 40-41, 80-81, ….
And if the base station transmits the unicast subframe and/or the unicast part by using the configuration of the DRS or the DMTC, the base station configures the DRS subframe or the DMTC subframe as a unicast subframe or an MBSFN subframe containing the unicast part to transmit a downlink signal or a channel.
For a subcarrier spacing of 15kHz (for MBSFN subframes), the downlink signal or channel is transmitted preferably in a specific unicast subframe and/or in an MBSFN subframe containing a unicast part, as configured. The reason is that for a subcarrier spacing of 15kHz, the effective symbol duration and the number of subcarriers contained per RB are consistent with the prior art, and a conventional downlink signal or channel may be transmitted in a unicast subframe or unicast portion.
For subcarrier spacing of 7.5kHz or less (for MBSFN subframes), it is preferred that certain unicast subframes transmit the downlink signals or channels as configured. Unicast subframes are transmitted at 15kHz subcarrier spacing.
Especially for the structure of long CP (equal to or greater than 33.33us), for the case where the subcarrier spacing is not 15kHz (e.g. 7.5kHz or lower), the MBSFN subframe is not suitable for containing the unicast part (one or more OFDM symbols) to transmit the conventional downlink signal or channel such as CRS, because the subframe structure and symbol length are changed in this case, and the conventional downlink channel or signal is not suitable for being transmitted on the MBSFN subframe. At this time, it is preferable to configure a dedicated unicast subframe to transmit a conventional downlink signal or downlink control channel.
For the conventional DRS, the DRS is transmitted according to a set period, offset, and duration. The DRS may be transmitted in a unicast subframe or an MBSFN subframe. If the configured DRS subframe falls on the unicast subframe or on the MBSFN subframe, the DRS can be transmitted on both subframe types. In fact, the prior art does not consider how DRSs are transmitted when the subcarriers are 7.5kHz or other smaller subcarrier spacing. In addition, when the number of symbols in a subcarrier changes at 15kHz, how DRS is transmitted is not solved. The above scheme can solve this. That is, the DRS subframe or the DMTC subframe is configured as a unicast subframe, or the DRS is transmitted through a specific unicast subframe.
That is, the dedicated subframe for transmitting the synchronization signal and/or the measurement signal is configured in the radio subframe; transmitting a downlink signal or a channel on the dedicated subframe according to the pre-configured configuration information, comprising:
configuring the dedicated subframe in a radio subframe if a subcarrier interval is 15 kHz; sending a downlink signal or a channel on the special subframe according to the pre-configured configuration information;
configuring the unicast subframe in a wireless subframe if the subcarrier spacing is not 15 kHz; sending a downlink signal or a channel on the unicast subframe according to configuration information;
if the downlink signal or the channel is a discovery signal, configuring the unicast subframe in a wireless subframe; and sending a downlink signal or a channel on the unicast subframe according to the configuration information.
Each cell in the traditional MBSFN area is identified according to different cells
Figure BDA0001272545050000101
(36.211) the PSS/SSS sequence is generated so that the above information cannot be transmitted over the MBSFN part. Therefore, in the prior art, subframe 0 and subframe 5 are not configurable as MBSFN subframes and can be used to transmit PSS/SSS and measurement signals or control channels. For the scenario that the Standalone scenario or the subframe 0/5 is configured as an MBSFN subframe, the MBSFN cell needs to have downlink synchronization or measurement capability, and PSS/SSS sequences sent by each cell in the MBSFN area or the synchronization area are different.
In the scheme, the MBSFN cell identifies according to the MBSFN area
Figure BDA0001272545050000111
(3GPP protocol 36.211) generates a new MBSFN synchronization sequence (i.e. a pre-configured synchronization signal sequence), that is, each cell in the MBSFN area generates the same synchronization sequence according to the same MBSFN area identifier, which can be used for MBSFN cell discovery and downlink synchronization.
The new synchronization sequence generation method may include:
identification of MBSFN areas
Figure BDA0001272545050000112
The previous cell identity can still be employed
Figure BDA0001272545050000113
In a packet manner, i.e.
Figure BDA0001272545050000114
The value of which is from 0 to 167,
Figure BDA0001272545050000115
the value is 0 to 2. Namely:
Figure BDA0001272545050000116
due to the fact that
Figure BDA0001272545050000117
The value range is 0-503,
Figure BDA0001272545050000118
the value range is 0-255. Therefore, for
Figure BDA0001272545050000119
Not all of
Figure BDA00012725450500001110
And
Figure BDA00012725450500001111
the value combination can be traversed, and resource waste can exist.
Or, a new grouping method is adopted to match the size of the MBSFN area identifier. For example, i.e.
Figure BDA00012725450500001112
The value of which is from 0 to 127,
Figure BDA00012725450500001113
the value is 0 to 1. Namely:
Figure BDA00012725450500001114
or, i.e. that
Figure BDA00012725450500001115
The value of which is from 0 to 63,
Figure BDA00012725450500001116
the value is 0 to 3. Namely:
Figure BDA00012725450500001117
alternatively, the existing PSS (for transmitting intra-group ID, i.e. PSS) is not employed
Figure BDA00012725450500001118
Value) and SSS (for transmitting group ID i.e.
Figure BDA00012725450500001119
Value) are hierarchically synchronized, i.e. not grouped. And a unique synchronization sequence mode is adopted to obtain synchronization, for example, only an MBSFN SS sequence exists, but the MBSFN SS sequence is not subdivided into a PSS and an SSS, and no grouping mode exists at this time.
The root factor u (root index u) of the MBSFN PSS sequence is the same as the root factor of the conventional cell PSS sequence. Particularly for MBSFN area identification and cell identification
Figure BDA00012725450500001120
Same grouping or MBSFN
Figure BDA00012725450500001121
With legacy cells
Figure BDA00012725450500001122
And (5) scenes with the same value range.
For example,
Figure BDA00012725450500001123
u＝25；
Figure BDA00012725450500001124
u＝29；
Figure BDA00012725450500001125
u＝34；
or, the root factor u (root index u) of the MBSFN PSS sequence is a subset of values of the root factor of the conventional cell PSS sequence.
For example,
Figure BDA00012725450500001126
the value is 0 to 1.
Figure BDA00012725450500001127
u＝25；
Figure BDA00012725450500001128
u-29; alternatively, the first and second electrodes may be,
Figure BDA00012725450500001129
u＝29；
Figure BDA00012725450500001130
u-34; and so on.
Or generating the synchronization sequence according to a new sequence generation mode according to a new grouping mode or the MBSFN synchronization sequence. For example, when the PSS has 2 possible values, the u value selects 2 possible values from the existing 3 values. Alternatively, a PSS/SSS sequence of a new length is generated according to the subcarrier spacing. For example, for a 7.5kHz subcarrier spacing, a longer PSS/SSS sequence, e.g., a 62 x 2 length sequence, is required.
A new MBSFN synchronization signal (i.e. a preconfigured synchronization signal sequence) may generate a sequence with a length of 62 according to the above method, and then add 50 s on both sides, and map to 72 subcarriers;
for subcarrier spacings smaller than 15kHz, such as 7.5kHz or 3.75kHz, each RB includes more subcarriers, e.g., for 7.5kHz, each RB includes 24 subcarriers. The MBSFN synchronization sequence may be generated as follows:
first based on MBSFN area identification
Figure BDA0001272545050000121
Generating a length-62 sequence. Further, 5 sequences of 0 length 72 were added to both sides.
And then generating a longer MBSFN synchronous sequence by adopting interpolation, repetition or comb based on the sequence with the length of 62 or 72. The interpolation or repetition may be interpolated or repeated per subcarrier, or per RB, or per 62 bits long, or per 72 bits long.
For example, for 7.5kHz, each RB includes 24 subcarriers, a PSS/SSS sequence of length 62 (s1, s2, s 3.., s62) is first generated by subcarrier interleaving 0 (e.g., s1,0, s2,0, s3,0, s4,0,.., s62,0), or repetition (e.g., s1, s1, s2, s2, s3, s3, s4, s 4.,. s62, s62), or repetition by RB or interleaving 0 (e.g., s1, s2, s 3.., s12, s1, s2, s 3.., s12, s13, s13,. s 13.. 13, s13, s 360,
0,0,0,0,0,0, s13, s14, s 15.), or repeating or complementing 0 in the entire sequence (e.g., s1, s 2.. s62, s1, s 2.., s 62).
The transmission period of the MBSFN synchronization signal may be 5ms or 10ms, and preferably may be transmitted on subframe 0, and/or subframe 5, and/or subframe 1, and/or subframe 6.
Further, the MBSFN synchronization signal may preferably be transmitted on the last OFDM symbol of the first slot of subframe 0 and/or subframe 5, and/or the MBSFN synchronization signal is transmitted on the second last OFDM symbol of the first slot of subframe 0 and/or subframe 5.
Alternatively, the MBSFN synchronization signal may preferably be transmitted on the third OFDM symbol of subframe 1 and/or subframe 6, and/or the MBSFN synchronization signal is transmitted on the last OFDM symbol of subframe 0 and/or subframe 5.
That is, the newly defined downlink signal transmitted on the MBSFN subframe may further include an MBSFN discovery signal (MBSFN-DRS), and the MBSFN-DRS may include an MBSFN synchronization signal and an MBSFN reference signal (MBSFN-RS). The MBSFN-DRS is used for MBSFN cell discovery, downlink synchronization and channel measurement. The signals in the MBSFN-DRS are generated according to the method. The MBSFN-DRS transmission configuration may include a transmission period, a transmission offset, and/or a transmission duration, and correspondingly, the UE side performs measurement according to the configured measurement period, measurement offset, and/or measurement duration.
Based on the method, the invention further provides a device for improving the MBMS capacity.
As shown in fig. 4, an apparatus for increasing MBMS capacity in an embodiment of the present invention is used in a base station, and the apparatus includes:
a configuration module 210 for configuring a dedicated subframe for transmitting a synchronization signal and/or a measurement signal in a radio subframe; the dedicated subframe is one of: a unicast subframe, an MBSFN subframe containing a unicast part and an MBSFN subframe with a pre-configured synchronization signal sequence;
a sending module 220, configured to send a downlink synchronization signal or a channel on the dedicated subframe according to the pre-configured configuration information.
Wherein the synchronization signal and/or the measurement signal comprises one of: a discovery signal, a cell reference signal, a primary synchronization signal/secondary synchronization signal, a CSI pilot frequency, a downlink UE special pilot frequency, a downlink control channel and a pre-configured synchronization signal sequence;
the sending module is further configured to send the pre-configured configuration information of the dedicated subframe to the user terminal; the configuration information includes a transmit configuration and a measurement configuration.
Furthermore, the device also comprises a judging module;
the judging module is used for triggering the configuration module to configure the special subframe in a wireless subframe if the subcarrier interval is 15 kHz;
triggering the configuration module to configure the unicast subframe in a wireless subframe if the subcarrier spacing is not 15 kHz; the sending module sends a downlink signal or a channel on the unicast subframe according to the configuration information;
if the downlink signal or the channel is a discovery signal, triggering the configuration module to configure the unicast subframe in a wireless subframe; and the sending module sends a downlink signal or a channel on the unicast subframe according to the configuration information.
Still further, the configuration module is specifically configured to configure the radio subframe 0 and/or the radio subframe 5 as the dedicated subframe.
Specifically, if the dedicated subframe is an MBSFN subframe including a preconfigured synchronization signal sequence; the device further comprises:
and the synchronizing signal sequence generating module is used for configuring a synchronizing signal sequence for each MBSFN cell according to the MBSFN area identifier of each MBSFN cell.
The device in the embodiment of the invention realizes the sending of the synchronization signal and/or the measurement signal in the MBSFN scene by improving the configuration of the frame structure, thereby effectively solving the problems of downlink synchronization and measurement in the MBSFN scene, improving the capacity of the MBMS system, being particularly suitable for the Standalone scene and the scene in which the subframe 0/5 is configured as the MBSFN subframe, improving the effect of the MBMS capacity, and simultaneously ensuring the synchronous transmission and measurement of the signals.
It should be noted that, in the embodiment of the present invention, the above method may be referred to for specific implementation of the apparatus, and details are not described herein.
While this application describes specific examples of the invention, those skilled in the art will appreciate that many modifications are possible in the exemplary embodiments without departing from the inventive concepts herein.
In light of the above teachings, those skilled in the art can make various modifications to the method of the present invention without departing from the scope of the present invention.

Claims (8)

1. A method for enhancing MBMS capacity, for use in a base station, the method comprising:
configuring a dedicated subframe for transmitting a synchronization signal and/or a measurement signal in a radio subframe; the special subframe is an MBSFN subframe containing a unicast part;
sending a downlink synchronous signal or a channel on the special subframe according to the pre-configured configuration information;
transmitting the MBSFN subframe including the unicast part by utilizing the configuration of the DRS or the configuration of the DMTC, wherein the configuration of the DRS comprises the duration of the DRS, and the configuration of the DMTC comprises at least one of the following: period, offset and measurement duration.
2. The method of claim 1, wherein the synchronization signal and/or measurement signal comprises one of: a discovery signal, a cell reference signal, a primary synchronization signal/secondary synchronization signal, a CSI pilot frequency, a downlink UE special pilot frequency, a downlink control channel and a pre-configured synchronization signal sequence;
before the sending the downlink signal or channel on the dedicated subframe according to the pre-configured configuration information, the method further includes:
sending the pre-configured configuration information of the special subframe to a user terminal; the configuration information includes a transmit configuration and a measurement configuration.
3. The method of claim 1, wherein a dedicated subframe for transmitting a synchronization signal and/or a measurement signal is configured in a radio subframe; transmitting a downlink signal or a channel on the dedicated subframe according to the pre-configured configuration information, comprising:
configuring the dedicated subframe in a radio subframe if a subcarrier interval is 15 kHz; and sending downlink signals or channels on the special subframes according to the pre-configured configuration information.
4. The method according to any of claims 1 to 3, wherein configuring the dedicated subframe for transmitting the synchronization signal and/or the measurement signal in the radio subframe specifically comprises:
configuring radio subframe 0 and/or radio subframe 5 as the dedicated subframe.
5. An apparatus for enhancing MBMS capacity, for a base station, the apparatus comprising:
a configuration module for configuring a dedicated subframe for transmitting a synchronization signal and/or a measurement signal in a radio subframe; the special subframe is an MBSFN subframe containing a unicast part;
a sending module, configured to send a downlink synchronization signal or a channel on the dedicated subframe according to pre-configured configuration information;
the configuration module is configured to send the MBSFN subframe including the unicast part by using configuration of a DRS or configuration of a DMTC, where the configuration of the DRS includes a duration of the DRS, and the configuration of the DMTC includes at least one of: period, offset and measurement duration.
6. The apparatus of claim 5, wherein the synchronization signal and/or measurement signal comprises one of: a discovery signal, a cell reference signal, a primary synchronization signal/secondary synchronization signal, a CSI pilot frequency, a downlink UE special pilot frequency, a downlink control channel and a pre-configured synchronization signal sequence;
the sending module is further configured to send the pre-configured configuration information of the dedicated subframe to the user terminal; the configuration information includes a transmit configuration and a measurement configuration.
7. The apparatus of claim 5, wherein the apparatus further comprises a determination module;
and the judging module is used for triggering the configuration module to configure the special subframe in a wireless subframe if the subcarrier interval is 15 kHz.
8. The apparatus according to any of claims 5-7, wherein the configuration module is specifically configured to configure radio subframe 0 and/or radio subframe 5 as the dedicated subframe.
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