CN106817722B - User equipment and channel measuring method thereof - Google Patents
User equipment and channel measuring method thereof Download PDFInfo
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- CN106817722B CN106817722B CN201510859850.1A CN201510859850A CN106817722B CN 106817722 B CN106817722 B CN 106817722B CN 201510859850 A CN201510859850 A CN 201510859850A CN 106817722 B CN106817722 B CN 106817722B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- 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
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Abstract
User equipment and a channel measurement method thereof, the method comprising: receiving channel measurement indication information sent by a base station; measuring symbols carrying channel states in a preset downlink subframe based on the channel measurement indication information, and generating corresponding channel state information; transmitting the generated channel state information to the base station so that the base station implements resource scheduling based on the channel state information. By the scheme, the accuracy of the channel state information measured by the user equipment can be improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a user equipment and a channel measurement method thereof.
Background
Long Term Evolution (LTE), a Long Term Evolution of Universal Mobile Telecommunications System (UMTS) technology standard established by The3rd generation Partnership Project (3 GPP) organization, was formally established and initiated at The 3GPP multi-toronto conference in 12 months in 2004. The LTE system introduces Orthogonal Frequency Division Multiplexing (OFDM) and multiple-Input multiple-Output (MIMO) key technologies, which significantly increases the spectrum efficiency and data transmission rate, and supports multiple bandwidth allocation: 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz, 20MHz and the like, and supports the global mainstream 2G/3G frequency band and some newly-added frequency bands, thereby the frequency spectrum allocation is more flexible, and the system capacity and the coverage are also obviously improved. The LTE system network architecture is more flat and simplified, and the complexity of network nodes and the system is reduced, so that the system time delay is reduced, and the network deployment and maintenance cost is also reduced. The LTE system supports interoperation with other 3GPP systems.
In the prior art, User Equipment (UE) measures the quality of a downlink Channel according to a Reference Signal, such as a Cell specific Reference Signal (CRS) or a Channel-state Information Reference Signal (CSI-RS), transmitted by a base station in a complete downlink subframe (1ms), and generates and reports corresponding Channel-state Information to the base station. And the base station implements resource scheduling according to the channel state information reported by the user equipment. However, in practical applications, the ue may not use a complete downlink subframe for communication, for example, the ue receives downlink control signaling and data in a time slot (0.5ms), and the channel state information fed back by the ue according to the existing mechanism is inaccurate, which results in poor efficiency of the base station for making the resource scheduling policy.
Disclosure of Invention
The technical problem solved by the embodiment of the invention is how to improve the accuracy of the channel state information measured by the user equipment.
In order to solve the above problem, an embodiment of the present invention provides a method for measuring a channel of a user equipment, where the method includes:
receiving channel measurement indication information sent by a base station;
measuring the reference signals in partial symbol length in the downlink subframe based on the channel measurement indication information, and generating corresponding channel state information;
transmitting the generated channel state information to the base station so that the base station implements resource scheduling based on the channel state information.
Optionally, when the user equipment is a device configured with EPDCCH, the channel measurement indication information includes information of a measurement start position.
Optionally, the measurement start position is a third sign bit in the downlink subframe.
Optionally, when the transmission time interval of the user equipment is less than 1ms, the time length of the channel measurement included in the channel measurement indication information is equal to the transmission time interval.
Optionally, the transmission time interval is less than or equal to 0.5 ms.
An embodiment of the present invention further provides a user equipment, where the user equipment includes:
a receiving unit, adapted to receive channel measurement indication information sent by a base station;
a channel measurement unit, adapted to measure reference signals within a partial symbol length in a downlink subframe based on the channel measurement indication information, and generate corresponding channel state information;
a transmitting unit adapted to transmit the generated channel state information to the base station so that the base station implements resource scheduling based on the channel state information.
Optionally, when the user equipment is a device configured with EPDCCH, the channel measurement indication information includes information of a measurement start position.
Optionally, the measurement start position is a third sign bit in the downlink subframe.
Optionally, when the transmission time interval of the user equipment is less than 1ms, the channel measurement indication information includes information that the time length of channel measurement is equal to the transmission time interval.
Optionally, the transmission time interval is less than or equal to 0.5 ms.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the scheme, the channel state on the part of the symbols in the complete downlink subframe is measured by configuring the user equipment, and the corresponding channel state information is generated, so that the channel state information fed back by the user equipment is matched with the channel state information measured by the base station scheduling user equipment and is more accurate, the accuracy of the channel measurement of the user equipment can be improved, the base station can perform resource scheduling according with the actual downlink channel quality, and the spectrum efficiency can be improved.
Drawings
Fig. 1 is a schematic diagram of a radio frame in LTE in the related art;
fig. 2 is a schematic diagram of RE positions occupied by CRS of two antenna ports in the prior art;
fig. 3 is a flowchart of a channel measurement method of a user equipment in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a user equipment in an embodiment of the present invention.
Detailed Description
In LTE, one radio frame contains 10 subframes, each of which contains two slots (slots), each of which has a time length of 0.5 ms.
Referring to fig. 1 and 2, for each antenna port, a unit corresponding to one subcarrier on one OFDM or Single-carrier Frequency-Division Multiple Access (SC-FDMA) symbol is referred to as a resource unit (RE). A physical resource having a width of 180kHz, which is continuous in the frequency domain, is called a Resource Block (RB) in one slot. For a normal Cyclic Prefix (CP), each slot contains 7 OFDM symbols l0～l6(ii) a For extended CP, each slot then contains 6 OFDM symbols.
The CRS is a signal transmitted by the base station in the downlink subframe to the ue for downlink channel estimation and measurement. Wherein, the REs occupied by the CRSs of different antenna ports are different. Referring to fig. 2, in the case of two antenna ports, the distribution of RE positions R0 occupied by CRS of the first antenna port and R1 occupied by CRS of the second antenna port,
indicating RE locations that are already occupied and unusable. The Channel State Information-Reference Signal (CSI-RS) is another Signal transmitted by the base station to the ue in some downlink subframes for downlink Channel State estimation. The user equipment can know whether CRS or CSI-RS needs to be adopted for channel state evaluation according to the configuration of the base station. In the following, CRS is taken as an example for explanation, and it should be emphasized that the scheme of the present invention is also applicable to a scenario of channel estimation by CSI-RS.
In the prior art, in order to evaluate and measure a downlink channel, a user equipment receives a CRS transmitted by a base station in a complete downlink subframe, measures the quality of the downlink channel according to the received CRS, generates corresponding channel state information, and reports the channel state information to the base station, and the base station implements resource scheduling according to the channel state information reported by the user equipment.
However, in practical applications, the ue may not use all symbols in a complete downlink subframe to communicate with the base station. For example, a user equipment configured with an Enhanced Physical Downlink Control Channel (EPDCCH), such as some user equipments capable of receiving only 1.4M bandwidth, receives a downlink control signaling on the EPDCCH on another symbol (symbol) located outside the control region, and receives data according to the downlink control signaling. For another example, when a Transmission Time Interval (TTI) is less than 1ms (Time length of one complete downlink subframe), the base station schedules the user equipment within the TTI. In the two scenarios, if the user equipment still evaluates the channel quality of the reference signal in one downlink subframe according to the existing mechanism, the channel state information will not match with the channel state information of less than 1ms required by the base station for actually scheduling the user equipment, and the base station will make wrong resource scheduling, which results in the waste of spectrum resources.
In order to solve the above problems in the prior art, in the technical scheme adopted in the embodiment of the present invention, the user equipment is configured to measure the reference signal within the partial symbol length of the downlink subframe, and generate the corresponding channel state information, so that the accuracy of channel measurement of the user equipment can be improved, the scheduling accuracy is further improved, and the spectrum efficiency is improved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 3 shows a flowchart of a channel measurement method of a user equipment in an embodiment of the present invention. The channel measuring method of the user equipment as shown in fig. 3 may include the following steps:
step S301: and receiving channel measurement indication information sent by the base station.
In specific implementation, the base station needs to perform corresponding resource scheduling according to the quality of the downlink channel. Meanwhile, the base station also knows how to schedule the user equipment, for example, whether to schedule the user equipment according to the EPDCCH or not, and whether to schedule the user equipment according to the TTI lower than 1ms, so that the base station knows whether to need the user equipment to evaluate the channel quality according to a new mechanism or not. In order to obtain the quality information of the downlink channel, the base station may require the ue to evaluate and measure the downlink channel by sending corresponding channel measurement indication information to the ue.
Step S302: and measuring the reference signals in partial symbol length in the downlink subframe based on the channel measurement indication information, generating corresponding channel state information and sending the channel state information to the base station, so that the base station implements resource scheduling based on the channel state information.
In an implementation, in the channel measurement indication information sent by the base station, the base station may instruct the ue to measure a reference signal within a length of a partial symbol (symbol) in a downlink subframe. When receiving the channel measurement indication information sent by the base station, the ue may measure (i.e., evaluate) the reference signals within a partial symbol length in the downlink subframe indicated in the channel measurement indication, generate corresponding channel state information, and send the channel state information to the base station.
In an embodiment of the present invention, when the TTI of the ue is less than 1ms (i.e. the base station schedules the ue in a TTI less than 1ms), the csi indicates that the duration of the channel measurement is equal to the TTI. For example, when the base station schedules the ue in 0.5ms TTI, the ue receives the downlink control signaling and data within 0.5ms duration. The base station may explicitly indicate the time length of channel measurement in the channel measurement indication information, that is, 0.5ms, or implicitly indicate the time length of channel measurement in the channel measurement indication information, that is, the base station may indicate that the user equipment needs to evaluate the channel quality according to the time length of 0.5ms, for example, the base station may set the transmission resource in configuring the channel state information (also in the channel measurement indication information) reported by the user equipment to be 0.5 ms.
When the user equipment is a device configured with EPDCCH, downlink control signaling and data transmission of the user equipment are both transmitted from the third symbol of each subframe, and therefore, the base station may instruct the user equipment to perform downlink channel measurement from the third symbol of the downlink subframe through the channel measurement indication information.
In another embodiment of the present invention, the base station may instruct the ue to perform channel state estimation on the reference channels on the partial symbols in the downlink subframe within a set time length through the channel state measurement indication information.
In a specific implementation, the preset time period may be set to be less than or equal to 0.5 ms. The base station may instruct the ue to report the channel state information measured in the duration less than or equal to 0.5ms (0.5ms is 1 timeslot) through RRC signaling, or the base station may configure the TTI less than or equal to 0.5ms through other parameters to instruct the ue to report the channel state information measured in the duration less than or equal to 0.5 ms.
It should be noted that before Release 13, the granularity for scheduling the ue is 1ms (that is, TTI is 1ms), that is, the ue receives the downlink control signaling and corresponding data in 1ms, receives a new downlink control signaling and new data in the next 1ms, and measures a reference signal with a duration of 1ms, evaluates channel quality, and generates corresponding channel state information. In Release 13, the scheduling granularity for the ue may become smaller, for example, 0.5ms or less, so as to shorten the data transmission delay.
On the one hand, when the TTI of the scheduling device becomes 0.5ms, the base station also expects to obtain channel state information for a duration of 0.5ms, which allows the channel state information measured by the user equipment to match the channel state information that the base station expects to obtain.
On the other hand, since the finally obtained channel state information is the average value of the channel state information on the symbol, when the time length is shortened to 0.5ms or less, the measured channel state information is also more accurate. Therefore, the base station can perform correct resource scheduling according to the channel state information fed back by the user equipment, and therefore, the frequency spectrum efficiency can be improved.
The following describes a device corresponding to the channel state information feedback method in the embodiment of the present invention in further detail.
Fig. 4 shows a schematic structural diagram of a user equipment in an embodiment of the present invention. The user equipment 400 shown in fig. 4 may include a receiving unit 401, a channel measuring unit 402, and a transmitting unit 403, wherein:
the receiving unit 401 is adapted to receive channel measurement indication information sent by a base station.
The channel measurement unit 402 is adapted to measure, based on the channel measurement indication information, a reference signal over a part of symbol lengths in a downlink subframe, and generate corresponding channel state information.
The sending unit 403 is adapted to send the generated channel state information to the base station, so that the base station implements resource scheduling based on the channel state information.
In a specific implementation, when the user equipment is a device configured with EPDCCH, the channel measurement indication information includes information of a measurement starting position.
In a specific implementation, the measurement start position is a third sign bit in the downlink subframe.
In a specific implementation, when the transmission time interval of the ue is less than 1ms, the channel measurement indication information includes information that the time length of channel measurement is equal to the transmission time interval.
In a specific implementation, the transmission time interval is less than or equal to 0.5 ms.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by instructions associated with hardware via a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
The method and system of the embodiments of the present invention have been described in detail, but the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A channel measurement method of a user equipment, comprising:
receiving channel measurement indication information sent by a base station;
based on the channel measurement indication information, taking partial symbol length in a downlink subframe as granularity, performing reference signal measurement, and generating channel state information corresponding to the granularity;
transmitting the generated channel state information to the base station so that the base station implements resource scheduling based on the channel state information.
2. The channel measuring method of claim 1, wherein when the user equipment is an EPDCCH-configured device, the channel measurement indication information includes information of a measurement starting position.
3. The channel measuring method of the UE of claim 2, wherein the measurement start position is a third sign bit in the downlink subframe.
4. The method according to claim 1, wherein when the transmission time interval of the ue is less than 1ms, the channel measurement indication information includes information that the time length of channel measurement is equal to the transmission time interval.
5. The channel measuring method of the UE of claim 4, wherein the transmission time interval is less than or equal to 0.5 ms.
6. A user device, comprising:
a receiving unit, adapted to receive channel measurement indication information sent by a base station;
a channel measurement unit, adapted to perform reference signal measurement with a partial symbol length in a downlink subframe as a granularity based on the channel measurement indication information, and generate channel state information corresponding to the granularity;
a transmitting unit adapted to transmit the generated channel state information to the base station so that the base station implements resource scheduling based on the channel state information.
7. The UE of claim 6, wherein when the UE is an EPDCCH-configured device, the channel measurement indication information includes information of a measurement start position.
8. The UE of claim 7, wherein the measurement start position is a third sign bit in the downlink subframe.
9. The UE of claim 6, wherein when the TTI of the UE is less than 1ms, the CSI includes information that the length of the CSI is equal to the TTI.
10. The UE of claim 9, wherein the transmission time interval is less than or equal to 0.5 ms.
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| KR20230150400A (en) * | 2017-06-14 | 2023-10-30 | 광동 오포 모바일 텔레커뮤니케이션즈 코포레이션 리미티드 | Time-domain resource information indication method and apparatus |
| CN108901071B (en) * | 2017-10-20 | 2020-04-14 | 华为技术有限公司 | Channel measurement method and user equipment |
| WO2021062806A1 (en) * | 2019-09-30 | 2021-04-08 | 华为技术有限公司 | Channel measurement method and communication device |
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| CN103458451A (en) * | 2012-05-28 | 2013-12-18 | 中兴通讯股份有限公司 | Channel quality information measurement method and device and channel quality information measurement resource allocation method and device |
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| CN102271401B (en) * | 2010-06-04 | 2013-11-06 | 华为技术有限公司 | Channel state information receiving method, device and system |
| US9807783B2 (en) * | 2013-11-16 | 2017-10-31 | Lg Electronics Inc. | Signaling method for comp scheme and apparatus therefor |
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| CN103339982A (en) * | 2011-02-09 | 2013-10-02 | 瑞典爱立信有限公司 | Efficient use of reference symbol resources in a hierarchical heterogeneous cell deployment |
| CN103380638A (en) * | 2011-02-09 | 2013-10-30 | 瑞典爱立信有限公司 | Point-dependent resource symbol configuration in a wireless cell |
| CN103458451A (en) * | 2012-05-28 | 2013-12-18 | 中兴通讯股份有限公司 | Channel quality information measurement method and device and channel quality information measurement resource allocation method and device |
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