CN111148209A

CN111148209A - Channel optimization method and device

Info

Publication number: CN111148209A
Application number: CN201811299739.1A
Authority: CN
Inventors: 李志军; 朱雪田; 张志荣
Original assignee: China Telecom Corp Ltd
Current assignee: China Telecom Corp Ltd
Priority date: 2018-11-02
Filing date: 2018-11-02
Publication date: 2020-05-12

Abstract

The present disclosure provides a channel optimization method and apparatus. And the channel optimization device judges whether the REG outside the effective bandwidth exists in the resource particle group REG carrying the information in the PHICH, and if the REG outside the effective bandwidth exists, the symbol power of the REG outside the effective bandwidth is reduced, and the symbol power of the REG inside the effective bandwidth is increased. According to the method and the device, the symbol power of the REG in the effective bandwidth is improved, and the symbol power of the REG outside the effective bandwidth is reduced, so that the demodulation success rate of the terminal can be effectively improved, and meanwhile, the interference to an adjacent system can be effectively reduced.

Description

Channel optimization method and device

Technical Field

The present disclosure relates to the field of communications, and in particular, to a channel optimization method and apparatus.

Background

With The development and improvement of 4G (The 4th Generation Mobile Communication Technology, fourth Generation Mobile Communication Technology) and LTE (Long Term Evolution) networks, a large number of users are moving to The LTE network, and network frequency resources are also strained. If the 4G network shares the 2G/3G network frequency band, the wide coverage characteristic of the low frequency band can be utilized to provide higher data transmission rate for users, and the investment cost of 4G on sites and frequency spectrum can be greatly reduced.

Disclosure of Invention

The inventor notices that, in order to adapt to different bandwidth frequency spectrums, improve the utilization rate of scattered frequency spectrums, and simultaneously increase the flexibility of frequency spectrum allocation, LTE supports 6 standard bandwidth operating modes, which are respectively: 1.4M, 3M, 5M, 10M, 15M, 20M, and in practical application, a suitable bandwidth operation mode can be selected according to the existing frequency band resources.

For example, the chinese telecommunications network C operates in the 800M band, the reverse direction 825M-835M, the forward direction 870M-880M, 7 frequency points including 37, 78, 119, 160, 201, 242, 283, and the newly added frequency point 1019. The frequency points are used for representing nominal frequency point numbers of the network working frequency band and can mark the central frequency of the modulated carrier. In order to make reasonable use of spectrum resources, 7 frequency points can be allocated to 1019, 37, 78, 119, 160, 201, 242 of CDMA, and 8.8M bandwidth can be allocated to LTE. If LTE uses 5M bandwidth mode, 3.8M bandwidth will be wasted, which is not reasonable when spectrum resources are scarce. To overcome this drawback, there is an LTE8.8M non-standard asymmetric scheme in the prior art. However, in this scheme, the REG carrying information in the PHICH channel may fall outside the effective bandwidth of 8.8M, thereby causing a problem that the terminal fails to demodulate the ACK/NACK feedback information and repeatedly retransmits.

Therefore, the present disclosure provides a scheme capable of effectively avoiding a terminal demodulation failure due to the REG falling outside the effective bandwidth.

In accordance with an aspect of one or more embodiments of the present disclosure, there is provided a channel optimization method including: judging whether a resource element group REG outside an effective bandwidth exists in a resource element group REG carrying information in a physical hybrid automatic repeat request indicator channel PHICH; if the REG outside the effective bandwidth exists, reducing the symbol power of the REG outside the effective bandwidth; symbol power of REGs within the effective bandwidth is boosted.

In some embodiments, a sum of a symbol power of the REGs outside the effective bandwidth and a symbol power of the REGs within the effective bandwidth remains unchanged.

In some embodiments, reducing the symbol power of the REGs that are outside the effective bandwidth comprises: reducing the symbol power of the REG outside the effective bandwidth to 0.

In some embodiments, boosting the symbol power of REGs that are within the effective bandwidth comprises: boosting the symbol power of the REGs within the effective bandwidth by the same magnitude.

In accordance with another aspect of one or more embodiments of the present disclosure, there is provided a channel optimization apparatus including: the identification module is configured to judge whether a Resource Element Group (REG) carrying information in a physical hybrid automatic repeat request indicator channel (PHICH) exists or not; an optimization module configured to reduce the symbol power of the REG outside the effective bandwidth and increase the symbol power of the REG within the effective bandwidth if there is a REG outside the effective bandwidth.

In some embodiments, the optimization module is configured to reduce the symbol power of the REGs that are outside the effective bandwidth to 0.

In some embodiments, the optimization module is configured to boost the symbol power of the REGs within the effective bandwidth by the same magnitude.

In accordance with another aspect of one or more embodiments of the present disclosure, there is provided a channel optimization apparatus including: a memory configured to store instructions; a processor coupled to the memory, the processor configured to perform a method according to any of the embodiments described above based on instructions stored in the memory.

According to another aspect of one or more embodiments of the present disclosure, there is provided a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, which when executed by a processor, implement a method as described above in relation to any one of the embodiments.

Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic diagram of frequency point occupation of LTE8.8M non-standard asymmetric scheme;

FIG. 2 is a diagram illustrating a basic processing flow of a PHICH physical channel;

FIG. 3 is an exemplary flow chart of a channel optimization method according to one embodiment of the present disclosure;

fig. 4 is an exemplary block diagram of a channel optimization apparatus according to an embodiment of the present disclosure;

fig. 5 is an exemplary block diagram of a channel optimization apparatus according to another embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.

Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Fig. 1 is a schematic diagram of frequency point occupation of LTE8.8M non-standard asymmetric scheme. As shown in fig. 1, the LTE network employs a 10M bandwidth mode, as shown by a in fig. 1. At this time, seven

frequency points

1019, 37, 78, 119, 160, 201, and 242 are occupied by LTE, that is, the effective bandwidth is 8.8M, as shown in b in fig. 1.

A PHICH (Physical Hybrid ARQ Indicator Channel) belongs to an LTE Physical layer downlink control Channel, and is located on a first OFDM (Orthogonal frequency division Multiplexing) symbol of each subframe. Multiple PHICHs are mapped onto the same set of Resource elements (Resource elements ) to form a PHICH group, wherein PHICHs in the same group are distinguished by different orthogonal sequences. PHICH resource is composed of sequence number group

Is shown in which

Is a sequence number of the PHICH group,

are the orthogonal sequence numbers within the group.

The PHICH carries HARQ (Hybrid Automatic Repeat Request ) ACK/NACK information used to identify whether the eNodeB has correctly received a transmission on the PUSCH (Physical Uplink Shared Channel). If correctly received, HI (HARQ Indicator) indication is set to 0, identifying ACK, otherwise set to 1, identifying NACK.

Fig. 2 is a schematic diagram of a basic processing flow of a PHICH physical channel. As shown in fig. 2, in the physical layer, the base station (eNodeB) will repeat 3 times for each HARQ acknowledgement information, i.e. the aforementioned 1-bit HI indication, to obtain 3-bit information. Then, BPSK modulation is used, an orthogonal sequence with the length of 4 is used for spreading, then a cell-specific scrambling sequence is used for scrambling, and finally 12 symbols are obtained. Since each REG (Resource element group) contains 4 REs, i.e. can carry 4 symbols, the generated 12 symbols require 3 REGs to carry.

In the LTE8.8M scenario of non-standard scheme, although LTE uses 10M bandwidth mode, the actual effective bandwidth is only 8.8M, and the other 1.2M bandwidth will be compressed. However, the PHICH still allocates the REG carrying the ACK/NACK information according to the 10M bandwidth, that is, the REG has a certain probability of falling outside the 8.8M bandwidth, which may cause the terminal to fail in demodulating the ACK/NACK feedback information, and further cause repeated retransmission.

For example, in the LTE8.8M non-standard scheme, one REG2 of the three segments REG0, REG1, and REG2 of the PHICH channel may fall outside the 8.8M bandwidth with a probability of 37.5%, respectively.

Fig. 3 is an exemplary flow chart of a channel optimization method according to an embodiment of the present disclosure. In some embodiments, the method steps of the present embodiment may be performed by a channel optimization device.

In step 301, it is determined whether there is an REG outside the effective bandwidth in the REGs carrying information in the PHICH channel.

For example, in the LTE8.8M non-standard scheme, if a certain REG is outside of 8.8M bandwidth, it is determined that the REG is outside of the effective bandwidth.

In step 302, if there are REGs outside the effective bandwidth, the symbol power of the REGs outside the effective bandwidth is reduced.

In some embodiments, the symbol power of REGs that are outside the effective bandwidth is reduced to 0. By forcibly muting the REG, the success rate of terminal decoding can be effectively improved.

In step 303, the symbol power of REGs within the effective bandwidth is boosted.

In some embodiments, the symbol power of REGs within the effective bandwidth are boosted by the same magnitude.

In some embodiments, the sum of the symbol power of REGs outside the effective bandwidth and the symbol power of REGs within the effective bandwidth remains unchanged. Interference with neighboring systems can thereby be avoided.

For example, among REGs 0, 1, and 2, which carry information in the PHICH channel, REG2 is outside the effective bandwidth. Thus, the symbol power of REG2 can be reduced to 0, and the symbol power of REG0, REG1 can be increased by 50%. Thus, under the condition that the total power is kept unchanged, the information symbol power in the effective bandwidth is improved.

In the channel optimization method provided in the foregoing embodiment of the present disclosure, the symbol power of the REG within the effective bandwidth is increased, and the symbol power of the REG outside the effective bandwidth is reduced, so that the demodulation success rate of the terminal can be effectively increased, and meanwhile, the interference to the adjacent system can be effectively reduced.

Fig. 4 is an exemplary block diagram of a channel optimization apparatus according to an embodiment of the present disclosure. As shown in fig. 4, the channel optimization apparatus includes an identification module 41 and an optimization module 42.

The identifying module 41 is configured to determine whether there is an REG that is outside the effective bandwidth among REGs carrying information in the PHICH.

The optimization module 42 is configured to reduce the symbol power of REGs outside the effective bandwidth and boost the symbol power of REGs within the effective bandwidth if there are REGs outside the effective bandwidth.

In some embodiments, the optimization module 42 is configured to reduce the symbol power of REGs that are outside the effective bandwidth to 0. The optimization module 42 is further configured to boost the symbol power of REGs within the effective bandwidth by the same magnitude.

In the channel optimization device provided in the foregoing embodiment of the present disclosure, by increasing the symbol power of the REG within the effective bandwidth and reducing the symbol power of the REG outside the effective bandwidth, the demodulation success rate of the terminal can be effectively increased, and meanwhile, the interference to the adjacent system can be effectively reduced.

Fig. 5 is an exemplary block diagram of a channel optimization apparatus according to still another embodiment of the present disclosure. As shown in fig. 5, the channel optimization apparatus includes a memory 51 and a processor 52.

The memory 51 is used for storing instructions, the processor 52 is coupled to the memory 51, and the processor 52 is configured to execute the method according to any embodiment in fig. 3 based on the instructions stored in the memory.

As shown in fig. 5, the channel optimization apparatus further includes a communication interface 53 for information interaction with other devices. Meanwhile, the device also comprises a bus 54, and the processor 52, the communication interface 53 and the memory 51 are communicated with each other through the bus 54.

The memory 51 may comprise a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory. The memory 51 may also be a memory array. The storage 51 may also be partitioned and the blocks may be combined into virtual volumes according to certain rules.

Further, the processor 52 may be a central processing unit CPU, or may be an application specific integrated circuit ASIC, or one or more integrated circuits configured to implement embodiments of the present disclosure.

The present disclosure also relates to a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the instructions, when executed by a processor, implement the method according to any one of the embodiments in fig. 3.

In some embodiments, the functional unit modules described above may be implemented as a general purpose Processor, a Programmable Logic Controller (PLC), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable Logic device, discrete gate or transistor Logic, discrete hardware components, or any suitable combination thereof for performing the functions described in this disclosure.

By implementing the present disclosure, the following advantageous effects can be obtained:

1) under the condition that the effective bandwidth is asymmetric, the power of each REG segment can be flexibly configured according to the PCI condition of a specific cell, the power outside the nonstandard asymmetric bandwidth is reduced, and the power in the effective bandwidth is improved;

2) the RRU does not need to be adjusted, and only needs to optimize a baseband algorithm, so that the deployment cost is greatly reduced;

3) the interference to the adjacent system is reduced, and the demodulation success rate of the cell is improved.

When the CDMA network of the operator gradually quits frequency and only one C network frequency point is reserved (1X frequency point), the method can be applied to hundreds of thousands of 800M 4G base stations of the operator.

The advantages of the present disclosure are also embodied in:

1) only the algorithm needs to be enhanced, hardware does not need to be changed, and engineering construction is not needed;

2) the 4G heavy plowing investment of the current 800M network of the China telecom is hundreds of billions of yuan, and if the technology is applied to the current network, the capacity expansion investment of the 800M network of the China telecom can be greatly saved.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

The description of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the disclosure in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the disclosure and the practical application, and to enable others of ordinary skill in the art to understand the disclosure for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A method of channel optimization, comprising:

judging whether a resource element group REG outside an effective bandwidth exists in a resource element group REG carrying information in a physical hybrid automatic repeat request indicator channel PHICH;

if the REG outside the effective bandwidth exists, reducing the symbol power of the REG outside the effective bandwidth;

symbol power of REGs within the effective bandwidth is boosted.

2. The method of claim 1, wherein,

the sum of the symbol power of the REGs outside the effective bandwidth and the symbol power of the REGs within the effective bandwidth remains unchanged.

3. The method of claim 2, wherein reducing the symbol power of the REGs that are outside of the effective bandwidth comprises:

reducing the symbol power of the REG outside the effective bandwidth to 0.

4. The method of claim 3, wherein boosting symbol power of REGs within an effective bandwidth comprises:

boosting the symbol power of the REGs within the effective bandwidth by the same magnitude.

5. A channel optimization apparatus, comprising:

the identification module is configured to judge whether a Resource Element Group (REG) carrying information in a physical hybrid automatic repeat request indicator channel (PHICH) exists or not;

an optimization module configured to reduce the symbol power of the REG outside the effective bandwidth and increase the symbol power of the REG within the effective bandwidth if there is a REG outside the effective bandwidth.

6. The apparatus of claim 5, wherein,

7. The apparatus of claim 6, wherein,

an optimization module is configured to reduce a symbol power of the REGs outside the effective bandwidth to 0.

8. The apparatus of claim 7, wherein,

the optimization module is configured to boost symbol power of the REGs within the effective bandwidth by the same magnitude.

9. A channel optimization apparatus, comprising:

a memory configured to store instructions;

a processor coupled to the memory, the processor configured to perform implementing the method of any of claims 1-4 based on instructions stored by the memory.

10. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions which, when executed by a processor, implement the method of any one of claims 1-4.