CN102957471B - The Enhancement Method and system of a kind of demodulated reference signal - Google Patents
The Enhancement Method and system of a kind of demodulated reference signal Download PDFInfo
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Abstract
The invention discloses a kind of Enhancement Method of demodulated reference signal and system, can increase configured information in high-rise RRC signaling, and this method also includes：The increased configured information with reference to LTE R10DCI format and in high-rise RRC signaling, the common occupation mode for determining demodulated reference signal port.The enhancing technology of demodulated reference signal of the present invention, on the basis of DCI format backward compatibility is ensured, it is not necessary to extra increase UE complexity, can flexibly realize the orthogonal or quasi- orthogonal configuration of demodulated reference signal port between different user；Cell spectrum efficiency thus can be effectively improved, enables in particular to effectively reduce interference under MU MIMO or CoMP scenes, precision of channel estimation is improved, so as to improve spectrum efficiency.
Description
Technical Field
The invention relates to the field of communication, in particular to a method and a system for enhancing a demodulation reference signal.
Background
In a wireless communication technology, when a base station such as an evolved node b (enb) and the like uses multiple antennas to transmit data, a spatial multiplexing method may be adopted to increase a data transmission rate, that is, a transmitting end uses the same time-frequency resource to transmit different data at different antenna positions, and a receiving end such as a User Equipment (UE) and the like also uses multiple antennas to receive data.
Under the condition of a Single user, resources of all antennas are distributed to the same user, the user independently occupies physical resources distributed by a base station side in a transmission interval, and the transmission mode is called Single user Multiple-Input Multiple-output (SU-MIMO); in the case of Multiple users, space resources of different antennas are allocated to different users, and one User and at least one other User share physical resources allocated at the base station side within one transmission interval, where the sharing mode may be a space division Multiple access mode or a space division multiplexing mode, and this transmission mode is called Multiple User Multiple-Input Multiple-output (MU-MIMO), where the physical resources allocated at the base station side refer to time-frequency resources.
If the transmission system is to support both SU-MIMO and MU-MIMO, the eNB needs to provide the UE with data in both modes. When the UE is in the SU-MIMO mode or the MU-MIMO mode, the UE needs to know the Rank (Rank) used by the eNB for transmitting the MIMO data for the UE. In the SU-MIMO mode, resources of all antennas are allocated to the same user, and the number of layers used for transmitting MIMO data is equal to the rank used by the eNB for transmitting MIMO data; in the MU-MIMO mode, the number of layers used for transmission of a corresponding user is less than the total number of layers used by the eNB for transmitting MIMO data, and if the SU-MIMO mode and the MU-MIMO mode are to be switched, the eNB needs to notify the UE of different control data in different transmission modes.
The following three downlink physical control channels are defined in Release (R) 8 standard of Long-Term Evolution (Long-Term Evolution, LTE): a Physical downlink Control Format Indicator Channel (PCFICH), a Physical Hybrid automatic retransmission Request Indicator Channel (PHICH), and a Physical Downlink Control Channel (PDCCH). The PDCCH is configured to carry Downlink Control Information (DCI), and includes: uplink and downlink scheduling information, and uplink power control information. The format of DCI (DCI format) is classified into the following: DCI format 0, DCI format 1A, DCI format1B, DCI format 1C, DCI format 1D, DCI format 2A, DCI format 3, and DCI format 3A; wherein the transmission mode 5 supporting MU-MIMO defined in release 8 utilizes Downlink control information of DCI format 1D, and Downlink power offset field (denoted as δ) in DCI format 1Dpower-offset) Information indicating power halving for one user in MU-MIMO mode, i.e., -10log10 (2). Because the MU-MIMO transmission mode 5 only supports MU-MIMO transmission of two users, the MU-MIMO transmission mode 5 can support the dynamic switching between SU-MIMO mode and MU-MIMO mode through the downlink power domain; however, whether in SU-MIMO mode or MU-MIMO mode, the DCI format supports only one stream transmission for one UE, and although LTE Release 8 supports single-user transmission of at most two streams in transmission mode 4, the switching between transmission modes can only be semi-static, so that single-user multi-stream transmission and multi-user transmission cannot be performed in LTE Release 8And (4) switching the states.
In release 9 of LTE, in order to enhance downlink multi-antenna transmission, a dual-stream Beamforming (Beamforming) transmission mode is introduced, and downlink control information adds DCI format2B to support this transmission mode, where there is an identification bit of a Scrambling sequence Identity (SCID) in DCI format2B to support two different Scrambling sequences, and an eNB may allocate the two Scrambling sequences to different users and multiplex multiple users in the same resource. In addition, when only one transport block is enabled, a New Data Indication (NDI) bit corresponding to a Disabled transport block is also used to indicate an antenna port in single-layer transmission.
In Release 10(Release 10) of LTE, in order to further enhance downlink multi-antenna transmission, a transmission mode 9 is introduced, where the transmission mode 9 further enhances beamforming that supports transmission of maximum 8 layers on the basis of dual-stream beamforming (mode 8) in LTE Release 9, and DCI format 2C is added to downlink control information to support this transmission mode, and in DCI format 2C, control signaling is designed by jointly encoding SCID, the number of layers, and antenna ports, and SCID bits used for indicating scrambling sequence identities in mode 8 are reused. Similarly, when only one transport block is enabled, the New Data Indication (NDI) bit corresponding to the non-enabled transport block is also used to indicate the antenna port for single layer transmission. In release 10, the ports are Orthogonal to each other by Orthogonal Code (OCC), and the OCC codes of different ports (port 7 to port 14) can be uniformly allocated as shown in table 1, where different Orthogonal Frequency Division Multiplexing (OFDM) symbols l' carrying demodulation reference signals (DMRSs) are used according to formula wp(l') determining.
Where, m' is 0, 1, 2, and corresponds to the relative position of each physical time-frequency resource block from low to high in fig. 1, and n is the relative position of demodulation pilot frequency, respectivelyPRBCorresponding to a fast index of physical time-frequency resources for Physical Downlink Shared Channel (PDSCH) transmission.
TABLE 1
Although transmission mode 9 can support data transmission of 8 layers at maximum in SU-MIMO mode, MU-MIMO is not enhanced relative to mode 8, i.e., demodulation pilot orthogonality in the case of only supporting two users at maximum and only 1 layer transmission per user. Meanwhile, the demodulation reference signal relied on by the transmission mode 9 is generated according to the cell identity (cellidenity), and in the modes 8 and 9, the demodulation pilot patterns between different nodes have the same position, and when the cell is at the edge, the pilot between users occupying the same resource by different nodes cannot realize orthogonality, so that the interference elimination is not facilitated. In particular, in a heterogeneous network, a macro cell and a Low Power Node (LPN) have severe interference. In LTE release 11, it is proposed to use the same cell identity for the macro cell and the low power node in the heterogeneous network, and to reduce the interference between nodes by centralized scheduling in the same cell identity for multiple high power nodes in the homogeneous network. Based on the DCI format 2C corresponding to the mode 9, only 2 layers of orthogonal transmission can be achieved between two nodes to the maximum, that is, only 1 layer of orthogonal transmission can be performed for each node, so that the orthogonality of demodulation pilots can be achieved, and the gain caused by cell splitting is greatly limited.
Disclosure of Invention
In view of the above, the present invention provides a method and a system for enhancing demodulation reference signals, which effectively improve spectrum efficiency.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for enhancing demodulation reference signal (DM-RS), wherein indication information is added in higher layer RRC signaling, the method further comprising: and jointly determining the use mode of the demodulation reference signal port by combining the DCI format of LTE R10 and the indication information added in the higher layer RRC signaling.
The method for determining the use mode of the demodulation reference signal port comprises the following steps:
adding DMRS port use limiting information in an RRC signaling, and taking the intersection of the port number which is not limited and the port number indicated in the DCI format as the port allocated by the transmission according to the port number which is limited to be used in the RRC signaling.
The RRC indication information comprises n bits;
wherein n is a positive integer greater than or equal to 1;
the n bit indication information is used for indicating the port number which is limited to be used by the current user, and n is 4 or 8.
The pilot sequence, the orthogonal mask OCC and the resource unit mapping position corresponding to each port number adopt a backward compatible mode with R10, and the overhead of the demodulation reference signal is determined by the port number indicated by the DCI format.
The method for determining the usage mode of the demodulation reference signal port further comprises the following steps:
and adding information for indicating the type of the demodulation reference signal and/or the overhead of the demodulation reference signal in the RRC signaling, and determining the port and/or the DMRS overhead allocated for the transmission according to the information for indicating the type of the demodulation overhead signal and/or the overhead of the demodulation reference signal in the RRC signaling and the port number indicated in the DCI format.
The RRC indication information comprises n bits; the RRC indication information comprises n bits;
wherein n is a positive integer greater than or equal to 1;
the n-bit indication information is used for indicating the type of the demodulation reference signal and/or the demodulation reference signal overhead notified in the DCI format, where n is 1 or 2.
The types of the demodulation reference signals include: a physical demodulation reference signal port and a virtual demodulation reference signal port;
the demodulation reference signal overhead is used to indicate whether the demodulation reference signal overhead is an overhead corresponding to a port allocated in the DCI format or according to a maximum overhead.
When the demodulation reference signal port type is a physical demodulation reference signal port type, the dciformate indicates that the port and the demodulation reference signal port defined by LTE R10 are in a one-to-one correspondence relationship;
when the demodulation reference signal port type is a virtual demodulation reference signal port type, the corresponding relationship between the port indicated by the dcifamat and the demodulation reference signal port defined by R10 is: v _ port7< - - > p _ port 9; v _ port8< - - > p _ port 10; v _ port9< - - > p _ port 7; v _ port10< - - > p _ port 8; v _ port11< - - > p _ port 12; v _ port12< - - > p _ port 11; v _ port13< - - > p _ port 14; v _ port14< - - > p _ port 13;
wherein the v-port x represents a port indicated by DCI format, and the p-port x represents a demodulation reference signal port defined in R10.
The parameters indicating the demodulation reference signal type and the demodulation reference signal overhead are transmitted by means of joint coding or independent coding.
An enhancement system of demodulation reference signals comprises an enhancement indication processing unit and a demodulation reference signal port distribution unit; wherein,
the enhanced indication processing unit is used for adding indication information in a high-layer RRC signaling;
the demodulation reference signal port allocation unit is configured to jointly determine a usage manner of a demodulation reference signal port in combination with the DCI format of LTE R10 and the indication information added by the enhanced indication processing unit in the higher layer RRC signaling.
The demodulation reference signal port allocation unit, when determining the usage pattern of the demodulation reference signal port, is configured to:
and adding information for limiting the use of the DMRS port in the RRC signaling, and taking the intersection of the port number which is not limited and the port number indicated in the DCI format as the port allocated for the transmission according to the port number which is limited to be used in the RRC signaling.
The RRC indication information comprises n bits;
wherein n is a positive integer greater than or equal to 1;
the n bit indication information is used for indicating the port number which is limited to be used by the current user, and n is 4 or 8.
The pilot sequence, the OCC and the resource unit mapping position corresponding to each port number adopt a backward compatible mode with R10, and the overhead of the demodulation reference signal is determined by the port number indicated by the DCI format.
The demodulation reference signal port allocation unit, when determining the usage pattern of the demodulation reference signal port, is further configured to:
and adding information for indicating the type of the demodulation reference signal and/or the overhead of the demodulation reference signal in the RRC signaling, and determining the port and/or the DMRS overhead allocated for the transmission according to the information for indicating the type of the demodulation overhead signal and/or the overhead of the demodulation reference signal in the RRC signaling and the port number indicated in the DCI format.
The RRC indication information comprises n bits; the RRC indication information comprises n bits;
wherein n is a positive integer greater than or equal to 1;
the n-bit indication information is used for indicating the type of the demodulation reference signal and/or the demodulation reference signal overhead notified in the DCI format, where n is 1 or 2.
The types of the demodulation reference signals include: a physical demodulation reference signal port and a virtual demodulation reference signal port;
the demodulation reference signal overhead is used to indicate whether the demodulation reference signal overhead is an overhead corresponding to a port allocated in the DCI format or according to a maximum overhead.
When the demodulation reference signal port type is a physical demodulation reference signal port type, the dciformate indicates that the port and the demodulation reference signal port defined by LTE R10 are in a one-to-one correspondence relationship;
when the demodulation reference signal port type is a virtual demodulation reference signal port type, the corresponding relationship between the port indicated by the dcifamat and the demodulation reference signal port defined by R10 is: v _ port7< - - > p _ port 9; v _ port8< - - > p _ port 10; v _ port9< - - > p _ port 7; v _ port10< - - > p _ port 8; v _ port11< - - > p _ port 12; v _ port12< - - > p _ port 11; v _ port13< - - > p _ port 14; v _ port14< - - > p _ port 13;
wherein the v-port x represents a port indicated by DCI format, and the p-port x represents a demodulation reference signal port defined in R10.
The augmentation instruction processing unit is to:
and transmitting parameters indicating the type of the demodulation reference signal and the overhead of the demodulation reference signal in a joint coding or independent coding mode.
The enhancement technology of the demodulation reference signal of the invention does not need to additionally increase the complexity of UE on the basis of ensuring the backward compatibility of DCI format, and can flexibly realize the orthogonal or quasi-orthogonal configuration of the demodulation reference signal ports among different users; therefore, the frequency spectrum efficiency of the cell can be effectively improved, particularly, the interference can be effectively reduced under the MU-MIMO or CoMP scene, and the channel estimation precision is improved, so that the frequency spectrum efficiency is improved.
Drawings
Fig. 1a to fig. 1c are schematic diagrams of demodulation pilots in LTE R10 at normal cyclic prefix;
fig. 2 is a schematic diagram illustrating demodulation reference signal enhancement in a port-restricted manner based on Radio Resource Control (RRC) signaling configuration according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating demodulation reference signal enhancement based on RRC signaling configuration port type and overhead indication according to an embodiment of the present invention;
FIG. 4 is a simplified diagram of a demodulation reference signal enhancement process according to an embodiment of the present invention;
fig. 5 is a diagram of a system for demodulation reference signal enhancement according to an embodiment of the invention.
Detailed Description
In order to effectively improve the spectrum efficiency of a cell, especially in a MU-MIMO or CoMP (coordinated multiple point transmission and reception) scenario, interference is reduced, and channel estimation accuracy is improved, thereby improving the spectrum efficiency; the method can add n-bit indication information in the high-level RRC signaling in combination with the LTE R10DCI format, and determine the use mode of the demodulation reference signal port by the DCI format and the added indication information; thereby improving the flexibility of port allocation. Wherein n may be a positive integer of 1 or more.
The n bit indication information is used for indicating the port number which is limited to be used by the current user, and n is 4 or 8. In this way, the terminal may take the intersection of the port number that is not restricted and the port number indicated in the DCI format according to the port number that is restricted in the RRC signaling, as the port allocated for this transmission.
The pilot sequence, the orthogonal code (OCC), and the resource unit mapping position corresponding to each port number are backward compatible with R10, and the overhead of the demodulation reference signal may be determined by the number of ports indicated by DCI format.
The n-bit indication information may also be used to indicate a type of a demodulation reference signal and/or a demodulation reference signal overhead notified in the DCI format, where n is 1 or 2;
the types of the demodulation reference signals include: a physical demodulation reference signal port and a virtual demodulation reference signal port; the demodulation reference signal overhead is used to indicate whether the demodulation reference signal overhead is an overhead corresponding to a port allocated in the DCI format or according to a maximum overhead.
When the demodulation reference signal port type is a physical demodulation reference signal port type, the dciformate indicates that the port and the demodulation reference signal port defined by LTE R10 are in a one-to-one correspondence relationship;
when the demodulation reference signal port type is a virtual demodulation reference signal port type, the corresponding relationship between the port indicated by the dcifamat and the demodulation reference signal port defined by R10 is: v _ port7< - - > p _ port 9; v _ port8< - - > p _ port 10; v _ port9< - - > p _ port 7; v _ port10< - - > p _ port 8; v _ port11< - - > p _ port 12; v _ port12< - - > p _ port 11; v _ port13< - - > p _ port 14; v _ port14< - - > p _ port 13; wherein the v-port x represents a port indicated by DCI format, and the p-port x represents a demodulation reference signal port defined in R10.
It should be noted that the concept of the physical demodulation reference signal port and the virtual demodulation reference signal port defined in the above demodulation reference signal port type is only for the convenience of description of the present patent, and is not limited to the above names in practice.
The parameter indicating the type of the demodulation reference signal and the demodulation reference signal overhead may be transmitted by means of joint coding or independent coding.
The invention is described in detail below with reference to the figures and examples.
In practical application, DCI format defined in LTE R10 may be fully utilized, and on this basis, by adding part of high-level indication information, more flexible allocation of demodulation reference signal ports is achieved, so as to better adapt to the needs of demodulation reference signal configuration in different scenarios, especially in MU-MIMO and HetNet (heterogeneous network) and CoMP scenarios. In the embodiment of the present invention, the indication is performed in a manner of combining DCI format 2C of LTE R10 with higher layer signaling, where in DCI format 2C defined in LTE R10, relevant control information related to a demodulation reference signal port is shown in table 2.
Table 2, control signaling format corresponding to demodulation reference signal port allocation in LTE R10DCI format 2C
Example 1:
in this embodiment, the indication information of n bits is configured in the RRC signaling to indicate the demodulation reference signal port restriction information. And combining the port indicated in the DCI format 2C and the port which is not limited in the RRC signaling, and taking the intersection of the ports indicated in the two kinds of information to obtain the final actually used port, wherein the overhead of the demodulation reference signal is determined by the port indicated in the DCIformat 2C.
For ease of understanding, a specific embodiment is given in conjunction with fig. 2, while reference is made to the demodulation reference signal pattern shown in fig. 1. In fig. 2, it is assumed that two users occupy the same time-frequency resource for data transmission, and a rank used for transmission of each user is 2 (in the embodiment, the first transmission is taken as an example, but is not limited to this in an actual scenario). In the RRC signaling in the figure, '0' denotes an unrestricted port, and '1' denotes a restricted port; for the port defined by LTE R0, the demodulation reference signal port corresponding to pi is i + 7.
In the LTE R10 scheme, since the configuration mode of the control signaling is the corresponding configuration index "0" or configuration index "1" in the case of two codeword streams shown in table 2, according to the configuration mode in the conventional LTE R10, the ports used by different users all correspond to port7 and port8, and the orthogonality of the demodulation reference signals cannot be achieved.
To achieve orthogonal transmission of two user demodulation reference signals. In this embodiment, the sender configures the configuration index "3" in table 2 in the control signaling, and at this time, for two users, the ports indicated in the DCI format are { p0, p1, p2, p3}, where pi corresponds to port i + 7; meanwhile, the receiving side can recognize that the demodulation reference signal pattern at this time is the demodulation reference signal pattern shown in fig. 1b according to the signaling.
Meanwhile, in a demodulation reference signal port limit set in the high-level RRC signaling, user 1 and user 2 are configured with "00110000" and "11000000" respectively (in practical application, according to a specific application mode, a bit length such as 4 bits may also be used for indication); combining the demodulation reference signal port restriction information in the RRC signaling and the indicated port information in the DCI format, it can be identified for user 1 that: the actual effective ports for this transmission are port7 and port 8; for user 2, it can be recognized that: the actual and effective ports for this transmission are port9 and port 10;
in conjunction with the demodulation reference signal pattern shown in fig. 1b, the user 1 and the user 2 can implement orthogonal transmission between the demodulation reference signal ports. Thereby facilitating the estimation of interference and the improvement of the quality of channel measurement results.
In addition, by flexibly configuring the demodulation reference signal port restriction information in the RRC signaling, it is also possible to implement transmission in a quasi-orthogonal (quadrature-orthogonal) mode between different users in a backward compatible mode. For example, in DCI format, states "0" and "1" shown in table 2 are configured for user 1 and user 2, respectively, and at the same time, bits of the demodulation reference signal port limitation information are all configured as "0" in RRC signaling, so that transmission in the quasi-orthogonal manner for user 1 and user 2 can be achieved.
In specific application, the initial position of the demodulation reference signal port can be flexibly configured in the manner.
Example 2:
in this embodiment, the indication information of n bits is configured in the RRC signaling, so as to indicate the type and/or overhead information of the demodulation reference signal port notified in the DCIformat. The demodulation reference signal type comprises a physical demodulation reference signal port type and a virtual demodulation reference signal port type.
When the physical demodulation reference signal port type is configured, the demodulation reference signal ports notified in the DCI format are consistent with the demodulation reference signal ports defined by LTE R10, that is, correspond one to one; when configured as a virtual demodulation reference signal port type, there is a specific mapping relationship between the demodulation reference signal port notified in DCI format and the demodulation reference signal port defined in LTE R10, and the mapping relationship is transparent to the UE.
For example, the demodulation reference signal port defined by LTE R10 is denoted by p-port (k) (for convenience of description, it is directly referred to as physical demodulation reference signal port hereinafter because it is consistent with physical demodulation reference signal port); v-port (k) indicates the demodulation reference signal port signaled in DCIformat, then:
when the demodulation reference signal port type in the RRC signaling is configured to be a physical demodulation reference signal type, v-port (k) corresponds to p-port (k) in a one-to-one manner;
when the demodulation reference signal port type in the RRC signaling is configured as a virtual demodulation reference signal port type, v-port (k) ═ f (p-port (k)); where f (x) denotes the mapping scheme for x. The mapping between the physical demodulation reference signal port and the virtual demodulation reference signal port may be performed in the following manner: v _ port7< - - > p _ port 9; v _ port8< - - > p _ port 10; v _ port9< - - > p _ port 7; v _ port10< - - > p _ port 8; v _ port11< - - > p _ port 12; v _ port12< - - > p _ port 11; v _ port13< - - > p _ port 14; v _ port14< - - > p _ port 13;
as shown in fig. 3, in the RRC signaling, it is assumed that the lower bits represent the demodulation reference signal overhead; high bit indicates port type; for the port defined by LTE R0, the demodulation reference signal port corresponding to pi is i + 7.
In fig. 3, the demodulation reference signal ports configured in the DCI formats of user 1 and user 2 are also both port7 and port8, and when corresponding to two codeword streams in table 2, the corresponding configuration indexes are "0" or "1", but the types of the demodulation reference signal ports configured in the RRC signaling are different:
the RRC signaling of the user 1 is configured with the port type of the physical demodulation reference signal, so that the corresponding p-ports are a port7 and a port 8; the configured in the RRC signaling of the user 2 is the virtual demodulation reference signal port type, so the corresponding p-ports are port9 and port 10;
when the RRC information for indicating the overhead of the demodulation reference signal is configured such that the overhead of the demodulation reference signal is the maximum overhead of the demodulation reference signal, the orthogonality of the demodulation reference signal between the user 1 and the user 2 can be achieved; and when the RRC signaling for indicating the demodulation reference signal overhead is configured to be the demodulation reference signal overhead indicated by the DCI format, quasi-orthogonality of the demodulation reference signals between the user 1 and the user 2 can be achieved.
By flexibly configuring the type information of the demodulation reference signal port in the RRC signaling and combining the DCIformat 2C, the quasi-orthogonal configuration can be realized by using different sequences when different users occupy the same resource.
It can be seen that the flexible configuration of the demodulation reference signal between different users can be realized by the method described in embodiment 2, thereby realizing the compromise between overhead and channel estimation accuracy.
In combination with the above embodiments, the method for enhancing demodulation reference signals according to the present invention has the operation concept as shown in fig. 4. Referring to fig. 4, fig. 4 is a simplified diagram of a demodulation reference signal enhancement process according to an embodiment of the present invention, where the process includes the following steps:
step 410: indication information is added in the higher layer RRC signaling.
Step 420: and jointly determining the use mode of the demodulation reference signal port by combining the DCI format of LTE R10 and the indication information added in the higher layer RRC signaling.
In order to ensure that the above embodiments and operation idea can be realized smoothly, the arrangement shown in fig. 5 can be performed. Referring to fig. 5, fig. 5 is a diagram of a demodulation reference signal enhancement system according to an embodiment of the present invention, where the system includes an enhancement indication processing unit and a demodulation reference signal port allocating unit connected to each other.
In practical application, the enhanced indication processing unit can add indication information in the higher layer RRC signaling. The demodulation reference signal port allocation unit can jointly determine the use mode of the demodulation reference signal port by combining the LTE R10DCI format and the indication information added by the enhanced indication processing unit in the higher layer RRC signaling.
In summary, the enhancement technology of demodulation reference signals in the invention, regardless of the method or the system, can flexibly realize orthogonal or quasi-orthogonal configuration of demodulation reference signal ports among different users without additionally increasing the complexity of UE (user equipment) on the basis of ensuring DCI format backward compatibility; therefore, the frequency spectrum efficiency of the cell can be effectively improved, particularly, the interference can be effectively reduced under the MU-MIMO or CoMP scene, and the channel estimation precision is improved, so that the frequency spectrum efficiency is improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (16)
1. A method for enhancing demodulation reference signal (DM-RS), wherein indication information is added in a higher layer Radio Resource Control (RRC) signaling, the method further comprising: determining the use mode of a demodulation reference signal port together with downlink control information DCI format of long term evolution LTE release R10 and the indication information added in the high-level RRC signaling;
the method for determining the use mode of the demodulation reference signal port comprises the following steps:
adding DMRS port use limiting information in an RRC signaling, and taking the intersection of the port number which is not limited and the port number indicated in the DCI format as the port allocated by the transmission according to the port number which is limited to be used in the RRC signaling.
2. The method of claim 1, wherein the RRC indication information comprises n bits;
wherein n is a positive integer greater than or equal to 1;
the n bit indication information is used for indicating the port number which is limited to be used by the current user, and n is 4 or 8.
3. The method according to claim 1 or 2,
the pilot sequence, the orthogonal mask OCC and the resource unit mapping position corresponding to each port number adopt a backward compatible mode with R10, and the overhead of the demodulation reference signal is determined by the port number indicated by the DCI format.
4. The method according to any one of claims 1 to 2, wherein the method for determining the usage pattern of the demodulation reference signal port further comprises:
and adding information for indicating the type of the demodulation reference signal and/or the overhead of the demodulation reference signal in the RRC signaling, and determining the port and/or the DMRS overhead allocated for the transmission according to the information for indicating the type of the demodulation overhead signal and/or the overhead of the demodulation reference signal in the RRC signaling and the port number indicated in the DCI format.
5. The method of claim 4, wherein the RRC indication information comprises n bits;
wherein n is a positive integer greater than or equal to 1;
the n-bit indication information is used for indicating the type of the demodulation reference signal and/or the demodulation reference signal overhead notified in the DCI format, where n is 1 or 2.
6. The method of claim 4,
the types of the demodulation reference signals include: a physical demodulation reference signal port and a virtual demodulation reference signal port;
the demodulation reference signal overhead is used to indicate whether the demodulation reference signal overhead is an overhead corresponding to a port allocated in the DCI format or according to a maximum overhead.
7. The method of claim 4,
when the demodulation reference signal port type is a physical demodulation reference signal port type, the DCI format indicates that the port and the demodulation reference signal port defined by LTE R10 are in a one-to-one correspondence relationship;
when the demodulation reference signal port type is a virtual demodulation reference signal port type, the port indicated by the DCI farat and the demodulation reference signal port defined by R10 have a corresponding relationship: v _ port7< - > p _ port 9; v _ port8< - > p _ port 10; v _ port9< - > p _ port 7; v _ port10< - > p _ port 8; v _ port11< - > p _ port 12; v _ port12< - > p _ port 11; v _ port13< - > p _ port 14; v _ port14< - > p _ port 13;
wherein v _ port x represents a port indicated by DCI format, and p _ port x represents a demodulation reference signal port defined in R10.
8. The method of claim 4,
the parameters indicating the demodulation reference signal type and the demodulation reference signal overhead are transmitted by means of joint coding or independent coding.
9. An enhancement system of demodulation reference signal, the system includes enhancement instruction processing unit, demodulation reference signal port assignment unit; wherein,
the enhanced indication processing unit is used for adding indication information in a high-layer RRC signaling;
the demodulation reference signal port allocation unit is configured to jointly determine a usage mode of a demodulation reference signal port in combination with the LTE R10DCI format and the indication information added by the enhanced indication processing unit in the high-level RRC signaling;
wherein, the demodulation reference signal port allocation unit, when determining the usage mode of the demodulation reference signal port, is configured to:
and adding information for limiting the use of the DMRS port in the RRC signaling, and taking the intersection of the port number which is not limited and the port number indicated in the DCI format as the port allocated for the transmission according to the port number which is limited to be used in the RRC signaling.
10. The system according to claim 9, wherein said RRC indication information includes n bits;
wherein n is a positive integer greater than or equal to 1;
the n bit indication information is used for indicating the port number which is limited to be used by the current user, and n is 4 or 8.
11. The system of claim 9 or 10,
the pilot sequence, the OCC and the resource unit mapping position corresponding to each port number adopt a backward compatible mode with R10, and the overhead of the demodulation reference signal is determined by the port number indicated by the DCI format.
12. The system according to any one of claims 9 to 10, wherein the demodulation reference signal port assignment unit, when determining the usage pattern of the demodulation reference signal port, is further configured to:
and adding information for indicating the type of the demodulation reference signal and/or the overhead of the demodulation reference signal in the RRC signaling, and determining the port and/or the DMRS overhead allocated for the transmission according to the information for indicating the type of the demodulation overhead signal and/or the overhead of the demodulation reference signal in the RRC signaling and the port number indicated in the DCI format.
13. The system according to claim 12, wherein said RRC indication information includes n bits;
wherein n is a positive integer greater than or equal to 1;
the n-bit indication information is used for indicating the type of the demodulation reference signal and/or the demodulation reference signal overhead notified in the DCI format, where n is 1 or 2.
14. The system of claim 12,
the types of the demodulation reference signals include: a physical demodulation reference signal port and a virtual demodulation reference signal port;
the demodulation reference signal overhead is used to indicate whether the demodulation reference signal overhead is an overhead corresponding to a port allocated in the DCI format or according to a maximum overhead.
15. The system of claim 12,
when the demodulation reference signal port type is a physical demodulation reference signal port type, the DCI format indicates that the port and the demodulation reference signal port defined by LTE R10 are in a one-to-one correspondence relationship;
when the demodulation reference signal port type is a virtual demodulation reference signal port type, the port indicated by the DCI farat and the demodulation reference signal port defined by R10 have a corresponding relationship: v _ port7< - > p _ port 9; v _ port8< - > p _ port 10; v _ port9< - > p _ port 7; v _ port10< - > p _ port 8; v _ port11< - > p _ port 12; v _ port12< - > p _ port 11; v _ port13< - > p _ port 14; v _ port14< - > p _ port 13;
wherein v _ port x represents a port indicated by DCI format, and p _ port x represents a demodulation reference signal port defined in R10.
16. The system of claim 12, wherein the augmentation-indication processing unit is configured to:
and transmitting parameters indicating the type of the demodulation reference signal and the overhead of the demodulation reference signal in a joint coding or independent coding mode.
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| CN108270711B (en) | 2017-01-04 | 2021-12-03 | 华为技术有限公司 | Method, device and system for transmitting reference signal |
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| CN108512642B (en) | 2017-05-05 | 2021-03-02 | 华为技术有限公司 | Method for determining reference signal sequence, terminal equipment and network equipment |
| CN109995498B (en) * | 2017-08-11 | 2020-03-10 | 华为技术有限公司 | DMRS (demodulation reference signal) indication and receiving method, transmitting terminal and receiving terminal |
| CN110830224B (en) * | 2018-02-13 | 2021-04-09 | 华为技术有限公司 | Method and related device for acquiring quantity of resource units in communication process |
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