WO2012162883A1

WO2012162883A1 - Power control method in non-adaptive retransmission and user equipment

Info

Publication number: WO2012162883A1
Application number: PCT/CN2011/074997
Authority: WO
Inventors: 景叔武
Original assignee: 华为技术有限公司
Priority date: 2011-05-31
Filing date: 2011-05-31
Publication date: 2012-12-06
Also published as: CN102918895B; CN102918895A

Abstract

A power control method in non-adaptive retransmission and a user equipment are disclosed in the present invention. The method includes: acquiring rising step size of transmission power of Physical Uplink Shared Channel (PUSCH) data; according to the rising step size of the transmission power of the PUSCH data, acquiring the transmission power of retransmission PUSCH data; selecting the minimum value between the transmission power of the retransmission PUSCH data and the maximum transmission power of the user equipment as the transmission power of the current retransmission PUSCH data; and adopting the transmission power of the current retransmission PUSCH data to retransmit the PUSCH data. The embodiments of the present invention can improve system performance.

Description

Power control method and user equipment in non-adaptive retransmission

Technical field

The present invention relates to mobile communication technologies, and in particular, to a power control method and user equipment in non-adaptive retransmission. Background technique

Long Term Evolution (LTE), as the evolution of the third generation (3G) technology, improves and enhances the 3G air access technology. For User Equipment (UE), the success rate of access is very high. Important, a higher access success rate is beneficial to improve system reliability. In the whole access process, the power control in the random access process is crucial. Only enough transmit power can ensure that the signal transmitted by the UE can be received and correctly demodulated by the network side, such as an evolved base station (eNodeB). If the UE's transmit power is too high, it will affect the access of other UEs, and the power is too low to guarantee successful access.

In the random access process, there is a series of signaling interactions between the UE and the network side to complete the handshake. The third message (msg3) is the second signaling in the uplink of the series of interactive signaling, so whether msg3 is Being successfully received by the network side and correctly demodulating is a crucial step in the success of random access, and the transmit power of the msg3 signal is the key to success. Wherein, msg3 is one of channel data transmitted in a Physical Uplink Shared Channel (PUSCH).

After the initial transmission of msg3 or other PUSCH data fails, the UE retransmits the msg3 or other PUSCH data, and the number of retransmissions is configured by the network side through system messages. The retransmission is divided into adaptive retransmission and non-adaptive retransmission. When the adaptive retransmission is performed, the network side indicates the UE to perform power adjustment, and in the non-adaptive retransmission, the UE calculates the previous transmission power according to the previous transmission power. The calculated transmit power is the smaller of the previous transmit power and the maximum transmit power.

In the non-adaptive retransmission, the UE calculates the transmit power based on the previous transmit power is less than Or equal to the previous transmit power, and may still fail to meet the demodulation threshold of the eNodeB, causing the transmission to fail again. After the maximum number of retransmissions is reached, the random access fails, which reduces the reliability of the system. Summary of the invention

The embodiment of the invention provides a power control method and user equipment in non-adaptive retransmission, which improves the transmission power of uplink data and improves the reliability of the system.

An aspect of the present invention provides a power control method in a non-adaptive retransmission, including: acquiring a rising step size of a PUSCH data transmission power of an uplink shared data channel; and acquiring a retransmitted PUSCH data according to a rising step size of the PUSCH data transmission power. The transmit power of the retransmitted PUSCH data and the maximum transmit power of the user equipment are taken as the transmit power of the retransmitted PUSCH data; PUSCH data. An aspect of the present invention provides a user equipment, including: an obtaining unit, configured to acquire a rising step of a PUSCH data transmission power of an uplink shared data channel; and a first determining unit, configured to increase a step size of the transmit power according to the PUSCH data, Acquiring a transmit power of the retransmitted PUSCH data; a second determining unit, configured to obtain a minimum value between the transmit power of the retransmitted PUSCH data and the maximum transmit power of the user equipment as the transmit power of the retransmitted PUSCH data; and the transmission unit And transmitting, by using the foregoing transmit power of the retransmitted PUSCH data, the PUSCH data. The above technical solution obtains the rising step of the transmission power, so that the transmission power at the time of retransmission is higher than the previous transmission power, and the transmission step is increased, and the transmission power can be increased as the number of retransmissions increases, thereby improving the access of the UE. Success rate, improve system performance. DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, a brief description of the drawings to be used in the description of the embodiments will be briefly made. It is obvious that the drawings in the following description are the present invention. For some embodiments of the present invention, other drawings may be obtained from those skilled in the art without any inventive labor.

1 is a schematic diagram of a power control method according to an embodiment of the present invention;

2 is a schematic diagram of a power control method according to another embodiment of the present invention;

3 is a schematic diagram of a power control method according to another embodiment of the present invention;

FIG. 4 is a schematic diagram of a user equipment according to an embodiment of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

FIG. 1 is a schematic diagram of a power control method according to an embodiment of the present invention, including the following content. 11 . Obtain the rising step size of the PUSCH data transmission power.

Optionally, the step of increasing the transmit power of the PUSCH data includes: receiving configuration information sent by the network side, where the configuration information includes a rising step of the PUSCH data transmit power; or acquiring a rising step of the PUSCH data transmit power. The long default value is the default value of the rising step size of the transmission power as the rising step size of the PUSCH data transmission power.

12. Obtain a transmit power of the retransmitted PUSCH data according to the rising step size of the PUSCH data transmission power.

Optionally, the foregoing obtaining the transmit power of the retransmitted PUSCH data according to the rising step size of the PUSCH data transmission power includes:

Obtaining a transmit power value and a number of retransmissions of the PUSCH data, and acquiring a transmit power of the retransmitted PUSCH data according to a transmit power value of the first PUSCH data, a number of retransmissions, and a rising step of the PUSCH data transmit power. . Specifically, it can be calculated The product of the rising step size of the PUSCH data transmission power and the number of retransmission times, and the sum of the product and the transmission power value of the PUSCH data initially transmitted as the transmission power of the retransmission PUSCH data.

Alternatively, the transmission power of the retransmitted PUSCH data is obtained based on the transmission power of the PUSCH data and the rising step size of the PUSCH data transmission power. Specifically, the sum of the transmission power of the PUCH data transmitted the previous time and the rising step of the PUSCH data transmission power may be used as the transmission power of the retransmission PUSCH data.

13. The minimum value between the transmit power of the retransmitted PUSCH data and the maximum transmit power of the UE is taken as the transmit power of the retransmitted PUSCH data.

14. The PUSCH data is retransmitted by using the transmission power of the PUSCH data of the current retransmission. The PUSCH data in the above embodiment may specifically be msg3 or other PUSCH data. In this embodiment, by increasing the step size of the transmit power, the transmit power at the time of the retransmission is higher than the previous transmit power, and the transmit power is increased as the number of retransmissions increases, thereby improving the access of the UE. Success rate, improve system performance.

FIG. 2 is a schematic diagram of a power control method according to another embodiment of the present invention. In this embodiment, a power control method for retransmitting PUSCH data in a non-adaptive retransmission is introduced in detail. Referring to FIG. 2, the embodiment includes the following content.

21. Determine the transmit power value of the initial PUSCH data.

The PUSCH data may include msg3, msg5 or PUSCH data transmission data, and the like.

For example, the transmit power of the initial transmitted PUSCH data ^ _USCH ( ) (in dBm) can be calculated by the following formula 2.1:

+ « ') - ^Ρ _Ρ , + ^Δ ΤΡ ( + ( } a formula 2.1 where: is the maximum UE transmit power, the unit is dBm; ^m PUSCH (0 is the transmission bandwidth of the i-th uplink subframe of the PUSCH, the unit is RB; estimated at the UE side; open loop control ^P .- ^{pusch G)} parameter (resolution ldB), in units of dB; is a path loss compensation factor, dimensionless Line path loss, in dB; ^Δ χ _Ρ (for cell level parameters, the unit is dB; /('') has power control adjustment step size, the unit is dB.

22, Obtain the rising step size of the PUSCH data transmission power ^.

Optionally, the obtaining parameter ^ may include the following two methods: (1) configuring the network side (such as an eNodeB), for example, configured by the eNodeB, and adding a non-adaptive retransmission to the system message sent by the eNodeB to the UE The configuration of the rising step parameter of the PUSCH data transmission power, for example, the eNodeB is sent to the UE through the system message SIB2. (2) Default configuration: Set a default value of ^. If no p is configured on the network side, use the default configuration value of the ^te p to calculate.

23. Determine the transmit power of the retransmitted PUSCH data.

For example, the transmit power (in dBm) of the retransmitted PUSCH data can be determined by the following formula 2.2:

_{——Formula} 2.2 where ^MAX is the maximum UE transmit power; P _IniffUSCH is the transmit power of the initial PUSCH data; for non-adaptive retransmission, the rising step size of the PUSCH data transmit power; for non-adaptive retransmission, The number of retransmissions of PUSCH data.

That is, the product of the rising step ^te p of the transmission power of the PUSCH data and the number of retransmissions W« can be calculated first, and the sum of the product and the transmission power value P _InitPUSai of the initial PUSCH data is _calculated .

( ^MtPUSCH + ep * ^( ) as the transmit power of the retransmitted PUSCH data, and then the retransmission

The minimum value between the transmission power of PUSCH data (P _ImtPUSCH + _tep *A ( ₀ ) and ^^ is taken as the transmission power L _{PUSCH of the current} PUSCH data.

As another optional embodiment, the UE may also determine, according to the transmit power of the previous transmission of the PUSCH data, the transmit power of the retransmitted PUSCH data. For example, the transmission power of the retransmission PUSCH data can be determined by the following formula 2.3.

= min{ _MAX尸_H ( -l) + U — Equation 2.3 where Ζ^α^' - Ι) is the transmit power of the previous PUSCH data transmission; ^P MAX is the maximum UE transmit power; In the PUSCH data transmission power climbing step.

After acquiring the transmit power of the retransmitted PUSCH data, the PUSCH data may be retransmitted by using the transmit power of the retransmission PUSCH data.

In this embodiment, the rising step size of the PUSCH data transmission power is obtained, so that the transmission power at the time of the retransmission is higher than the previous transmission power, and the transmission step is increased, and the transmission power can be increased as the number of retransmissions increases, and the PUSCH is improved. The success rate of digital transmission increases system throughput.

FIG. 3 is a schematic diagram of a power control method according to another embodiment of the present invention. The PUSCH data in this embodiment takes msg3 as an example, and details a power control method for retransmitting msg3 in non-adaptive retransmission, and FIG. 3, Embodiments include the following.

31. Determine the transmit power value of the initial transmitted msg3.

For example, the transmit power L _tmsg3 (0 (in dBm)) of the initial transmitted msg3 can be calculated by the following formula 2.1:

^ _ltmsg3 ( - min{P _MAX 101og ₁₀ ( _msg3 ( )) + P ₀ _ _msg iJ) + «0) - ^ρ _Ρ ι + ^Δ χ _Ρ ( + ( } — Equation 3.1 where: is the maximum UE transmit power, unit dBm; M _msg3 ( ) is the transmission bandwidth of the i-th uplink subframe of the PUSCH, and the unit is RB; P. _msg3 () is the open-loop control parameter (resolution is ldB), the unit is dB; is the path loss compensation factor, Dimensional; estimated downlink path loss for the UE side, in dB; ^Δ χ _Ρ (for cell level parameters, the unit is dB; /('') has power control adjustment step size, the unit is dB.

32. Obtain the climbing step ^te p of the msg3 transmit power.

Optionally, the method of obtaining the parameter township may include the following two methods: (1) Network side (e.g., eNodeB) configuration: configured by the eNodeB, where the eNodeB sends a system message to the UE, adding a non-adaptive retransmission Msg3 configuration of the climb step parameter for transmit power, such as eNodeB pass-through The system message SIB2 is sent to the UE. (2) Default configuration: Set a default value of ^. If there is no configuration on the network side, use the default configuration value of the _P to calculate.

33. Determine the transmit power of this retransmission msg3.

For example, the transmission power of the retransmitted PUSCH data can be determined by the following formula 3.2. _Remsg3 (0 (in dBm) _: P _Remsg3 (0 = min{P _{MAX Imtmsg3} + ^ _step *^ ₍₀ }

a formula 3.2

Where: ^ is the transmit power of the first transmitted msg3; ^fe p is the climb step of the msg3 transmit power in the non-adaptive retransmission; the number of retransmissions of the msg3 in the non-adaptive retransmission.

That is, the product of the rising step size of the transmission power of msg3 and the number of retransmissions ⁷ ^ ^ can be calculated first, and the sum of the product and the transmission power value P _taltasg3 of the initial transmission _msg 3 (P _Imtmsg3 + _tep *A( ₀ ) is taken as Retransmit the transmit power of the PUSCH data, and then retransmit the transmit power of the msg3

(The minimum value between ^ln _ltmsg 3 + tep*^( ) is used as the transmission power pemsg3 of the current retransmission m _Sg 3 as another alternative embodiment, and the UE may also calculate according to the transmission power of the previous transmission msg3. This time, the transmission power of msg3 is retransmitted. For example, the transmission power of this retransmission msg3 can be determined by the following formula 3.3.

Corpse _Remsg3 (0 =

- Equation 3.3 where -1) is the previous transmit power, ^P MAX is the maximum UE transmit power; is the climb step size of the msg3 transmit power in the non-adaptive retransmission.

After acquiring the transmit power of the retransmitted msg3, the msg3 may be retransmitted by using the transmit power of the retransmission msg3. In this embodiment, only the msg3 signaling is taken as an example, and the retransmission PUSCH data power control method is introduced. The power control method for retransmitting other PUSCH data can refer to the formula 2.1-2.3. The transmit power is higher than the transmit power of the previous transmit msg3. The rise step can increase the transmit power as the number of retransmissions increases, improve the UE access success rate, and improve system performance.

FIG. 4 is a schematic diagram of a user equipment according to an embodiment of the present invention, including: an obtaining unit 41, a first determining unit 42, a second determining unit 43, and a transmitting unit 44. The obtaining unit 41 is configured to acquire a rising step of PUSCH data transmission power. The first determining unit 42 is configured to obtain the transmit power of the retransmitted PUSCH data according to the rising step of the PUSCH data transmission power, and the second determining unit 43 is configured to obtain the transmit power of the retransmitted PUSCH data and the maximum transmit of the user equipment. The minimum value between the powers is used as the transmission power of the retransmission PUSCH data. The transmission unit 44 is configured to retransmit the PUSCH data by using the transmission power of the current retransmission PUSCH data.

The obtaining unit 41 is specifically configured to receive configuration information sent by the network side, where the configuration information includes a rising step of the PUSCH data transmission power, or obtain a default value of the rising step size of the PUSCH data transmission power, and send the foregoing The default value of the power ramp step as the above

The rising step size of the PUSCH data transmission power.

The first determining unit 42 is specifically configured to obtain a transmit power value and a retransmission number of the PUSCH data that are initially transmitted, and a rising step according to the transmit power value of the PUSCH data, the retransmission times, and the PUSCH data transmit power. Obtaining the transmit power of the above-mentioned retransmitted PUSCH data. Further, the first determining unit 42 may be specifically configured to calculate a product of the rising step size of the PUSCH data transmission power and the number of retransmission times, and the above product and the above initial transmission

The sum of the transmission power values of the PUSCH data is used as the transmission power of the above-mentioned retransmission PUSCH data.

Alternatively, the first determining unit 42 is specifically configured to obtain the transmit power of the retransmitted PUSCH data according to the transmit power of the PUSCH data and the rising step of the PUSCH data transmit power. Further, the first determining unit 42 may be specifically configured to use, as the transmit power of the retransmitted PUSCH data, a sum of a transmit power of the foregoing PUSCH data and a rising step of the PUSCH data transmit power. The transmitting unit 44 may be specifically configured to retransmit the msg3 signaling by using the transmit power of the retransmission PUSCH data.

In this embodiment, by obtaining the rising step size of the transmission power, the ratio of the transmission power at the time of retransmission is made. The previous transmission power is high, the climbing step is long, and the transmission power can be increased as the number of retransmissions increases, the UE's access success rate is improved, and system performance is improved.

It can be understood that related features in the above methods and devices can be referred to each other. In addition, "first", "second", and the like in the above embodiments are used to distinguish the embodiments, and do not represent the advantages and disadvantages of the embodiments.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions. The foregoing program may be stored in a computer readable storage medium, and when executed, the program includes The foregoing steps of the method embodiment; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced; and the modifications or substitutions do not deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

Rights request

A power control method for non-adaptive retransmission, comprising: obtaining a rising step of a PUSCH data transmission power of an uplink shared data channel;

Obtaining a transmission power of the retransmitted PUSCH data according to a rising step size of the PUSCH data transmission power;

And taking a minimum value between the transmit power of the retransmitted PUSCH data and the maximum transmit power of the user equipment as the transmit power of the retransmitted PUSCH data;

The PUSCH data is retransmitted by using the transmit power of the current retransmission PUSCH data.

2. The method according to claim 1, wherein the obtaining a step size of the PUSCH data transmission power comprises:

Receiving configuration information sent by the network side, where the configuration information includes a rising step of the PUSCH data transmission power; or

Obtaining a default value of the rising step size of the PUSCH data transmission power, and using a default value of the rising step of the transmitting power as a rising step size of the PUSCH data transmission power.

The method according to claim 1 or 2, wherein the acquiring the transmit power of the retransmitted PUSCH data according to the rising step size of the PUSCH data transmission power comprises:

Obtaining a transmit power value of the PUSCH data initially transmitted and a number of retransmissions;

And acquiring, according to the transmit power value of the PUSCH data, the number of retransmissions, and the rising step size of the PUSCH data transmission power, the transmit power of the retransmitted PUSCH data.

The method according to claim 3, wherein the acquiring step according to the transmit power value of the initial transmission of the PUSCH data, the number of retransmissions, and the rising power of the PUSCH data transmission power Transmitting the transmit power of the PUSCH data, including:

Calculating a product of a rising step size of the PUSCH data transmission power and the number of retransmissions, and using a sum of the product and the transmit power value of the initially transmitted PUSCH data as a transmission of the retransmitted PUSCH data power.

The method according to claim 1 or 2, wherein said according to said PUSCH Obtaining the transmit power of the data transmission power, obtaining the transmit power of the retransmitted PUSCH data, including: acquiring the retransmitted PUSCH data according to the transmit power of the previous PUSCH data and the rising step size of the PUSCH data transmit power Transmit power.

The method according to claim 5, wherein the acquiring the retransmitted PUSCH data according to the rising transmit step of the transmit power of the PUSCH data and the rising power of the PUSCH data transmit power Transmit power, including:

And a sum of a rising step of transmitting the PUSCH data and a rising step of the PUSCH data transmission power as a transmission power of the retransmitted PUSCH data.

The method according to any one of claims 1-6, wherein the PUSCH data comprises: msg3 signaling.

8. A user equipment, comprising:

An obtaining unit, configured to acquire a rising step of the uplink shared data channel PUSCH data transmission power;

a first determining unit, configured to acquire, according to the rising step size of the PUSCH data transmission power, a transmit power of the retransmitted PUSCH data;

a second determining unit, configured to obtain a minimum value between a transmit power of the retransmitted PUSCH data and a maximum transmit power of the user equipment as a transmit power of the retransmitted PUSCH data; and

And a transmitting unit, configured to retransmit the PUSCH data by using the transmit power of the current retransmission PUSCH data.

The device according to claim 8, wherein the acquiring unit is configured to: receive configuration information sent by the network side, where the configuration information includes a rising step of the PUSCH data transmission power; or

The device according to claim 8 or 9, wherein the first determining unit is specifically configured to: Obtaining a transmit power value of the PUSCH data initially transmitted and a number of retransmissions;

The device according to claim 10, wherein the first determining unit is specifically configured to:

The device according to claim 8 or 9, wherein the first determining unit is specifically configured to:

The transmission power of the retransmitted PUSCH data is obtained according to a transmission step of transmitting the PUSCH data and a rising step of the PUSCH data transmission power.

The device according to claim 12, wherein the first determining unit is specifically configured to:

The device according to any one of claims 8 to 13, wherein the PUSCH data comprises: msg3 signaling.