CN101267664A - Method and device for resource allocation and transmission of reference signals - Google Patents

Abstract

The invention discloses a resource allocation method of a reference signal, which includes allocating code channels for the reference signal within the basic frequency hopping bandwidth; and allocating different frequency hopping bandwidths for the reference signals of at least two code channels. The invention also discloses a reference signal resource allocation device, a reference signal transmission method and a device. Using the present invention enables the system to support the coexistence of reference signals of different bandwidths, and can meet different demands of different users on bandwidths. When used for channel quality measurement, this method can support multiple users to perform channel quality measurement of various bandwidths at the same time, which enhances the flexibility of the system; at the same time, the sequence used by the code channel adopts the sequence of CAZAC characteristics, which improves the performance of channel estimation. In addition, the method provided by the present invention prevents the system from appearing sequences of various lengths, thereby avoiding mutual interference between long and short sequences among surrounding cells, and reducing the complexity of sequence planning.

Description

Method and device for resource allocation and transmission of reference signals

technical field

The present invention relates to wireless communication technology, in particular to a method and device for resource allocation and transmission of reference signals.

Background technique

In a wireless communication system with multi-user (terminal) communication, each user transmits on a different wireless channel path, and the channel fading experienced by each user is also different, so that the current user has better transmission performance in certain transmission frequency bands, while in Deep fading on certain frequency bands. In order to improve the capacity and throughput, the system can make full use of the transmission differences between different users, which is usually called multi-user diversity. The system can use the difference in time and frequency of the user's transmission channel to configure different time and frequency band resources for different users through a reasonable and effective scheduling algorithm, so that each user can use the wireless resources with the best or better transmission performance. data transfer on. Therefore, in the uplink communication between users and the base station, in order to make full use of multi-user diversity, the base station needs to know the channel quality information of the access users, so as to effectively allocate resources for users and maximize the system gain.

In a system that schedules users in the frequency domain, the base station bases the fading states of different users on different frequency bands. In order for the base station to obtain the channel information of the user in different frequency bands, the user needs to send a signal modulated by a certain sequence to the base station. The signal experiences a wide wireless frequency band, which can usually be called a reference signal, also called a pilot signal; the base station The sequence is known, so after receiving the signal sent by the user, by comparing and processing it with the original sent sequence, that is, channel estimation, the fading experienced by the user on a channel in a wider frequency domain can be obtained. That is to say, the user sends the pilot signal so that the receiving end of the base station can obtain the quality of the user's wireless transmission channel through channel estimation. In practice, the pilot signal can be a common pilot signal sent for data demodulation and also used for channel measurement, or it can be a measurement pilot specially used for channel quality measurement.

When the system is performing frequency domain scheduling, the measurement pilot must undoubtedly provide channel measurement on a wider frequency band, otherwise sufficient multi-user diversity gain of frequency domain scheduling cannot be obtained. For the bandwidth of the specific measurement pilot, many factors should be considered: because the geographical location of the user is different from the base station, and the bandwidth of the pilot signal transmitted by the user is limited by its transmission power; Requirements are also different, so pilot signals with multiple measurement bandwidths need to exist in the system. In addition, although it is most beneficial for scheduling performance that all users provide channel quality measurements within the full scheduling bandwidth, the scheduling bandwidth of the system is usually limited. In order to support more users to perform measurements at the same time, it is necessary to restrict some users The measurement bandwidth, so the system can provide different measurement bandwidth.

When measurement pilots of various bandwidths exist in the system, an efficient method for multiplexing these signals is required.

Traditional code division multiplexing methods, such as the orthogonal code division multiplexing method using Walsh (Walsh) and pseudo-random sequence (PN, PseudoNoise), can only multiplex signals with the same bandwidth. For example, based on a certain frequency hopping unit, different users are multiplexed in the basic frequency hopping unit with different code sequences, and perform frequency hopping over time until the channel quality measurement within the system-wide scheduling bandwidth is completed. There is only one kind of measurement bandwidth in this system, that is, the full scheduling bandwidth, and all users need the same time interval to complete the measurement in the full system scheduling bandwidth.

Obviously, the system in this solution does not support the coexistence of pilot signals with multiple measurement bandwidths, nor can it flexibly meet the different bandwidth requirements of different users. At the same time, the system is slightly inflexible: either the number of people supported is reduced, or Measurement performance is affected.

In addition, since the transmit waveform using the PN sequence does not have the characteristic of constant amplitude, the requirements for the power amplifier of the transmitter are relatively high; at the same time, because the amplitude of the PN sequence in the frequency domain is different, when the base station receiver performs channel estimation, it is inevitable that it will be due to the The signal amplitude on individual subcarriers is relatively small, which affects the performance of overall channel estimation.

Other methods of multiplexing the measurement pilots of multiple bandwidths include time division, frequency division and hybrid division multiplexing, but each has some problems. For example, in a single-carrier frequency-division multiple access system (SC-FDMA, SingleCarrier-frequency The comb frequency division multiplexing method adopted in the Division Multiple Access) system.

Before explaining the principle of the comb frequency division multiplexing method, first explain the constant amplitude zero autocorrelation (CAZAC, constant amplitude zero auto-correlate) sequence.

The CAZAC sequence has the characteristic of constant amplitude zero autocorrelation, and its specific characteristics are: the modulus of the amplitude is a constant value, for example, it can be normalized to 1; the zero-period autocorrelation characteristic, except for the maximum correlation with itself, the sequence itself The autocorrelation with other cyclic shift sequences is zero. Due to the above characteristics of the sequence, after Fourier transform, the sequence of the sequence in the frequency domain is also a CAZAC sequence, which has the same characteristics, that is, constant amplitude and zero autocorrelation characteristics.

There are many ways to generate CAZAC sequences, including Zadoff-Chu (Zadoff-Chu), Generalized Chirplike Sequence (GCL, Generalized Chirplike Sequence) and Milewski sequence, etc. Taking the Zadoff-Chu sequence as an example, its generation method is as follows:

Among them, r is a number relatively prime to N, and q is an arbitrary integer. When different r values are taken, different sequences are obtained. r is a parameter of sequence generation, and can also be called a number or index of the generated sequence. Different q corresponds to different cyclic shifts.

Generally speaking, the sequence generated by different cyclic shifts of a CAZAC sequence is called the cyclic shift sequence generated by the same base sequence, and the cyclic shift sequence still has good periodic autocorrelation with itself, and is still consistent with the original sequence , other base sequences of the same length and other periodic shift sequences of the same length maintain low cross-correlation. The periodic shift here refers to: the base sequence of length N is expressed as (c ₀ , c ₁ , c ₂ , ..., c _N-1 ), and the periodic shift sequence whose shift is m is expressed as (c _Nm , c _N-m+1 , . . . , c _N-1 , c ₀ , c ₁ , . . . , c _Nm-1 ).

For sequences obtained by two different values of r, such as r=u, r=v, when uv and N are mutually prime, the cross-correlation of these two sequences is very small, that is, they have very good cross-correlation. In particular, when N itself is a prime number, r=1, 2, ..., N-1, N-1 different CAZAC sequences are generated, called base sequences, and the cross-correlation between these CAZAC sequences For example, in the above example, when N is a prime number, the absolute value of cross-correlation is

The so-called comb-shaped frequency division is to divide all sub-carriers into several "comb-shaped" sub-carrier systems according to the method of equal interval extraction. Multiplexing signals of the same bandwidth. Fig. 1 is the schematic diagram of existing comb-shaped frequency division multiplexing method, referring to Fig. 1, different combs represent different subcarriers, and the 1st, 4...22 subcarriers carry measurement pilots whose measurement bandwidth is B1, The 2nd, 5...23 subcarriers carry measurement pilots with a measurement bandwidth of B2, and the 3rd, 6...24 subcarriers carry measurement pilots with a measurement bandwidth of B3. It can be seen from the figure that B1=2×B2 =4*B3. Therefore, at the same pilot transmission moment, different users can transmit signals with different bandwidths. For example, the method shown in Figure 1 can simultaneously support one user to perform channel quality measurement with a bandwidth of B1, and two users to perform channel quality measurements with a bandwidth of B2. Quality measurement, four users perform channel quality measurement with a bandwidth of B3.

In this method, pilot signals of each bandwidth are only sent on certain subcarriers, and when CAZAC sequences, such as Zadoff-Chu sequences, are used as pilot sequences, the length of the sequence used is correspondingly reduced. For example, when the signal bandwidth is B1, and the pilot signal is transmitted on 8 subcarriers, the sequence length used is about 8; therefore, the smaller the signal bandwidth, the smaller the sequence length used. For example, when the measurement bandwidth is B3, The pilot signal is only carried on 2 subcarriers for transmission, and the corresponding sequence length is about 2. It can be seen from the characteristics of CAZAC sequences that the number of CAZAC sequences is affected by its length, and when the length is smaller, the number of CAZAC sequences will be smaller. When multiple cells use the same frequency resource to transmit pilot signals, in order to avoid mutual interference, each cell needs to use a different base sequence. However, the shortening of the sequence will affect the sequence planning of the whole system, that is, there are not enough base sequences to be allocated to the surrounding cells. In addition, since the frequency resources used by the surrounding cells are relatively independent, if signals of different bandwidths, that is, sequences of different lengths are transmitted on some of the same subcarriers, interference between sequences of different lengths will occur. To avoid or reduce interference, it is necessary to increase the complexity of system planning.

Contents of the invention

In view of this, an embodiment of the present invention provides a method for allocating resources of a reference signal, which supports coexistence of reference signals of various bandwidths.

An embodiment of the present invention provides a reference signal resource allocation device, which supports the coexistence of reference signals with multiple bandwidths.

An embodiment of the present invention provides a method for transmitting a reference signal, which supports the coexistence of reference signals with multiple bandwidths.

An embodiment of the present invention provides a device for transmitting a reference signal, which supports the coexistence of reference signals with multiple bandwidths.

In order to achieve the above object, the technical solution of the embodiment of the present invention is achieved in this way:

A resource allocation method for reference signals, comprising: allocating code channels for reference signals within a basic frequency hopping bandwidth; and allocating different frequency hopping bandwidths for reference signals of at least two code channels.

A method for transmitting a reference signal, comprising determining a code sequence used by a reference signal within a basic frequency hopping bandwidth; One of at least two different frequency hopping bandwidths of the signal.

A resource allocation device for reference signals, including a code channel allocation module and a frequency hopping bandwidth allocation module, the code channel allocation module is used to allocate code channels for reference signals within the basic frequency hopping bandwidth;

The frequency hopping bandwidth allocation module is configured to allocate different frequency hopping bandwidths to at least two reference signals of the allocated code channels.

A reference signal transmitting device, including a code sequence determination module and a transmitting module,

The code sequence determination module is used to determine the code sequence used by the reference signal within the basic frequency hopping bandwidth;

The transmitting unit is configured to frequency hop transmit the reference signal within the allocated frequency hopping bandwidth, and the frequency hopping bandwidth is one of at least two different frequency hopping bandwidths allocated to different reference signals by the network side.

Compared with the prior art, in the technical solution provided by the embodiment of the present invention, by allocating different code channels for reference signals within the basic frequency hopping bandwidth, and allocating different frequency hopping bandwidths for reference signals of at least two code channels, The reference signals of different users are frequency-hopped in different frequency bands, thereby satisfying different requirements of different users for bandwidth and enhancing the flexibility of the system. When used for channel quality measurement, it can support multiple users to perform channel quality measurement with different bandwidths, thus improving the flexibility of the system.

Description of drawings

Fig. 1 is the schematic diagram of existing comb frequency division multiplexing method;

FIG. 2 is a flowchart of a method for resource allocation of reference signals in an embodiment of the present invention;

FIG. 3 is a schematic diagram of a resource allocation method for a reference signal in Embodiment 1 of the present invention;

FIG. 4 is a schematic diagram of a resource allocation method for reference signals in Embodiment 2 of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The resource allocation method of the reference signal provided by the embodiment of the present invention includes: allocating code channels for the reference signal within the basic frequency hopping bandwidth; and allocating different frequency hopping bandwidths for the reference signals of at least two code channels. Wherein, the reference signal is also referred to as a pilot signal, and the code sequence used in the code channel may be: PN sequence, Walsh code, or CAZAC sequence. The basic frequency hopping bandwidth refers to the physical bandwidth of the reference signal, which is also the basic frequency unit for frequency hopping transmission of the reference signal; the frequency hopping bandwidth refers to the bandwidth experienced or covered by the reference signal during frequency hopping within a certain period of time.

Implementation Mode 1

In the preferred embodiment provided by the present invention, a reference signal resource allocation method provided by the embodiment of the present invention is described in detail by taking CAZAC sequence as the pilot sequence as an example. CAZAC sequences have shifted orthogonal properties. For example, when different users or different transmit antennas use different shifted sequences of the same base sequence, the sequence is transmitted in the time domain, and at the same time, the length of the shift is greater than the maximum multipath delay of the multipath channel (or the total energy is 90 % of the maximum path delay, etc.), the signals of different transmission sequences are orthogonal, and the base station receiving end can eliminate the interference of other users or other antennas by using the sequence correlation, so that a more accurate channel can be obtained Estimated results.

On the other hand, CAZAC sequences have constant amplitude properties. Specifically, the pilot signal transmitted by the user has the same amplitude on each subcarrier in the frequency domain. Therefore, the receiver can fairly estimate the channel fading on each subcarrier without due to the comparison of signal amplitudes on individual subcarriers. Small, affecting the performance of the overall channel estimation. At the same time, since the CAZAC sequence is also of constant amplitude in the time domain, the peak-to-average ratio of the waveform in the time domain is small, which is easy for the transmitter to transmit.

When the pilot signal is used for channel quality measurement, the pilot signal is called a measurement pilot, the basic frequency hopping bandwidth is called the basic measurement bandwidth, and the allocated frequency hopping bandwidth is called the measurement bandwidth. The basic measurement bandwidth covers the allocated measurement bandwidth by frequency hopping transmission at multiple pilot transmission times, so as to complete the measurement.

Taking the pilot signal used for channel quality measurement as an example, FIG. 2 is a flowchart of a resource allocation method for a reference signal in an embodiment of the present invention. As shown in FIG. 2, the method includes the following steps:

Step 201: Allocate code channels for measurement pilots within the basic measurement bandwidth.

Step 202: Allocate different measurement bandwidths for measurement pilots of at least two code channels.

The above steps are not in sequence, and can be performed simultaneously or sequentially.

Step 201 is described in detail below, and the code channel allocation for the measurement pilot within the basic measurement bandwidth is specifically:

The base station allocates measurement bandwidth according to the needs of each user, and uses different shifted orthogonal CAZAC sequences to allocate code channels for pilot signals with different measurement bandwidths. For example, different orthogonal sequences are corresponding to multiple code channels, which are numbered separately. For example, the CAZAC sequence uses a Zadoff-Chu sequence, and code channel 0 can be the original Zadoff-Chu sequence without any shift, and the code channel 1 is a sequence obtained by performing a periodic shift of length 3 on the original Zadoff-Chu sequence, and code channel 2 is a sequence obtained by performing a periodic shift of length 6 on the original Zadoff-Chu sequence. The shift sequence used only needs to ensure that the length of the periodic shift is greater than the maximum multipath delay of the multipath channel. The user can send the pilot signal after knowing the corresponding code channel according to the allocated measurement bandwidth.

After the above code channel numbering, the allocation of the code channel number can be done in two ways:

One way is to correspond the relationship between different bandwidths and code channels in a certain predetermined mode. For example, the system defaults that the pilot signal with a measurement bandwidth of B occupies code channel 0, and the pilot signal with a measurement bandwidth of 2B occupies code channel 1. The pilot signal with a measurement bandwidth of 3B occupies code channel 2, and so on. Therefore, when the base station allocates the measurement bandwidth B to a user, the user knows that the transmission should be performed on code channel 0.

Another way is that the base station explicitly notifies the code channel number used by each measurement bandwidth. For example, when resource allocation is performed for users measuring bandwidth B, code channel 0 is allocated at the same time, code channel 1 is allocated for users measuring bandwidth 2B, and code channel 2 is allocated for users measuring bandwidth 4B.

Step 202 is described in detail below, and different measurement bandwidths are allocated to the measurement pilots of at least two code channels, specifically:

FIG. 3 is a schematic diagram of a resource allocation method for reference signals in Embodiment 1 of the present invention. As shown in FIG. 3 , the basic measurement bandwidth is B, and the size of the basic measurement bandwidth can be preset or defaulted by the system, for example, it can be 1.25MHz, It may also be dynamically adjusted by the base station according to requirements. In Fig. 3, three kinds of measurement bandwidths are allocated to the reference signals of the three code channels, namely bandwidths B, 2B and 4B. Among them, the users allocated with the basic measurement bandwidth B only measure the channel quality within their basic measurement bandwidth; while the users allocated with a measurement bandwidth greater than B complete the channel quality measurement within their measurement bandwidth through multiple frequency hopping. The pilot signals of different measurement bandwidths are multiplexed in the basic measurement bandwidth through code division. The code division method specially pointed out here is realized by utilizing the shifted orthogonality characteristic of the CAZAC sequence. Referring to Fig. 3, T0, T1, T2 and T3 shown in the figure are four pilot transmission moments.

For example, the measurement bandwidths allocated to 4 users are all B, and code channel 0 is allocated to them. Among them, user 1's resources are at time T0, and the frequency band range is F3-F4; user 2's resources are at T1 time, and the frequency band range is F2-F3; and user 3's resources are at T2 time, and the frequency band range is F1-F2. The resource of 4 is time T3, and the frequency band range is F0-F1. For a user whose measurement bandwidth is 2B, the allocated resource is at time T0, and the frequency band range is F3-F4, and at T1 time, the frequency band range is F2-F3; The measurement was completed for the measurement bandwidth of 2B. The measurement bandwidth of 2B requires two frequency hops to complete the measurement, while the measurement bandwidth of 4B requires four frequency hops to complete the channel quality measurement.

For the total resource allocated by the system to the measurement pilot, it can be the time-frequency resource marked with hatching in Figure 3, that is to say, only one resource of the basic measurement bandwidth is available at each moment, so that the time period T0-T4 The resources in are allocated to four users who perform channel quality measurement with a bandwidth of B, two users who perform channel quality measurement with a bandwidth of 2B, and one user who performs channel quality measurement with a bandwidth of 4B. Of course, if the system allocates other time-frequency resources in Figure 3 to the measurement pilots, then these resources can also be allocated according to the above method, so that pilot signals with different measurement bandwidths can be multiplexed together; at the same time, due to With the increase of resources, more users can be measured simultaneously. At this time, due to the increase in the amount of resources, the system also needs more instructions when allocating resources to users, such as the time offset and frequency offset corresponding to the resources. Which pilot is transmitted on which frequency band at which time.

Implementation mode two

In another embodiment, the main steps are the same as the previous embodiment, step 301: allocate code channels for measurement pilots within the basic measurement bandwidth; step 302: allocate different measurement bandwidths for measurement pilots of at least two code channels .

The difference from the foregoing embodiments is that the frequency hopping periods of the measurement pilots of different measurement bandwidths may be different. The frequency hopping period refers to the time interval for the complete frequency hopping of the signal. Usually, the frequency hopping period is related to the measurement bandwidth and the basic measurement bandwidth. That is to say, the measurement bandwidth is different with the frequency hopping period. Referring to FIG. 3 , for a signal with a measurement bandwidth of 4B, its frequency hopping period is 4 pilot signal transmission intervals, and for a signal with a measurement bandwidth of B, its frequency hopping period is 1 pilot signal transmission interval. At the same time, signals with different measurement bandwidths also have a transmission period. The transmission period refers to the number of times the signal is transmitted within a certain time unit. The transmission period can be individually limited or configured according to requirements. For example, in the time period of T0-T4 shown in FIG. 3 , the signal transmission period of the users of each measurement bandwidth is 1, that is, the signals of the users of each measurement bandwidth are only transmitted once.

With reference to Fig. 4, it is also possible to set the transmission period of the pilot signal of user 1 whose measurement bandwidth is B to be 4, so that user 1 will continue to send measurement pilots at the next 4 pilot transmission moments, which can improve user performance. 1 Reception performance of transmitted measurement pilots.

In practical applications, for the above implementation manners, the base station can more flexibly allocate time-frequency resources and code channel numbers for each user. Theoretically, when allocating the bandwidth for the pilot signal, the measurement bandwidth of any integer multiple of the basic measurement bandwidth can be allocated. The more types of measurement bandwidth the system supports, the more flexible the system is, but the greater the signaling overhead that needs to be notified by the base station or the network side during allocation, therefore, the system needs to make a compromise according to actual needs.

Implementation Mode Three

In another embodiment, the main steps are the same as the previous embodiment, step 401: allocate code channels for measurement pilots within the basic measurement bandwidth; step 402: allocate different measurement bandwidths for measurement pilots of at least two code channels .

The difference from the foregoing embodiments is that the code channel numbers assigned to each reference signal can be fixed to one code channel for one reference signal as described in the above embodiments. In this embodiment, different code channel numbers can also be changed at different times. Codes are assigned. At this time, either the base station notifies the user of the currently used code channel number; or the user changes the code channel number according to a preset pattern, for example, the code channel number jumps in a pseudo-random manner. For example, from code channel number 0 to code channel number 7, the code channel number is changed every time the channel quality measurement is performed twice.

In the resource allocation methods of the aforementioned reference signals, the base station or the network side allocates measurement pilot resources for different users, but in practice, they may also be allocated for different transmit antennas of the same user.

Implementation Mode Four

Embodiments of the present invention also provide a method for transmitting a reference signal, the method including the following steps:

Step 501: Determine the code sequence used by the reference signal within the basic frequency hopping bandwidth;

Step 502: Perform frequency hopping to transmit the reference signal within the allocated frequency hopping bandwidth, where the frequency hopping bandwidth is one of at least two different frequency hopping bandwidths allocated to different reference signals by the network side.

The code sequence used by the reference signal is a constant amplitude zero autocorrelation CAZAC sequence.

The CAZAC sequence is a Zadoff-Chu base sequence and/or its period shifted sequence.

The reference signal transmission period is configurable to be different. For example, as shown in Figure 4, the transmission period of the pilot signal of user 1 whose measurement bandwidth is B is 4, so that user 1 will continue to send measurement pilots at the next 4 pilot transmission moments, which can improve user 1’s transmission rate. The reception performance of the measurement pilot. If the user's transmission period is 2, the user continues to send measurement pilots at the next two pilot sending moments.

In practical applications, when this method is used for channel quality measurement, users whose measurement bandwidth is larger than the basic measurement bandwidth can perform frequency hopping measurement according to a preset frequency hopping pattern. The frequency hopping pattern can be cell-specific, that is, according to the A pseudo-random frequency hopping pattern obtained by identifying (ID) and other characteristic information; it can also simply increase or decrease the frequency band position according to time. The simplest one is users with a measurement bandwidth of 4B as shown in Figure 3, perform frequency hopping in the order of frequency bands, and transmit measurement pilots on F3~F4, F2~F3, F1~F2, and F0~F1 in turn.

In the actual measurement process, considering the coherent bandwidth of the channel, resources can also be allocated for the measurement pilot on a part of the frequency band of the measurement bandwidth, and the user only performs frequency hopping transmission on this part of the frequency band when transmitting the measurement pilot. At this time, the system sets a smaller basic measurement bandwidth, so that the smaller basic measurement bandwidth represents the channel quality of a larger bandwidth. Therefore, when a user measures a channel with a wider frequency band, he can only measure a part of the frequency band in the frequency band, without traversing and measuring all the frequency bands, he can obtain the channel quality information of the user in the allocated measurement bandwidth, which can save Time resources, while also allowing more users to measure.

Implementation Mode Five

The embodiment of the present invention also provides a reference signal resource allocation device, including a code channel allocation module and a frequency hopping bandwidth allocation module.

Wherein, the code channel allocation module is used to allocate code channels for the reference signal within the basic frequency hopping bandwidth;

The frequency hopping bandwidth allocation module is used for allocating different frequency hopping bandwidths for at least two reference signals allocated code channels.

Embodiment six

The embodiment of the present invention also provides a reference signal transmitting device, including a code sequence determination module and a transmitting module.

Wherein, the code sequence determination module is used to determine the code sequence used by the reference signal within the basic frequency hopping bandwidth;

The transmitting module is configured to frequency hop transmit the reference signal within the allocated frequency hopping bandwidth, and the frequency hopping bandwidth is one of at least two different frequency hopping bandwidths allocated to different reference signals by the network side.

The transmitting device may be set in a user terminal.

It can be seen from the above that the technical solutions provided by the embodiments of the present invention multiplex reference signals of different allocated bandwidths on corresponding code channels, and support the coexistence of reference signals of various bandwidths.

The technical solution provided by the embodiment of the present invention, when used for channel quality measurement, supports each user to perform channel quality measurement of different bandwidths, not just the channel quality measurement of the full scheduling bandwidth; and the pilot signals of different bandwidths are code-divided multiplexing, thereby supporting multiple users to perform channel quality measurement at the same time, and enhancing the flexibility of the system.

In the technical solution provided by the embodiment of the present invention, since the code division multiplexing of reference signals is in the same basic measurement bandwidth, the sequence lengths used are all the same. Therefore, even in the environment of a cell, the surrounding cells There are also no sequences of other lengths, thereby avoiding the occurrence of strong interference between sequences of different lengths and reducing the complexity of sequence planning.

At the same time, since the basic frequency hopping bandwidth used in the embodiment of the present invention is preset by the system or adjusted according to its own needs, it can meet the restrictions on sequence length and number, and can provide enough base sequences to allocate to The surrounding cells reduce the complexity of sequence planning in the system.

The technical solution provided by the embodiment of the present invention uses the CAZAC sequence as the pilot sequence. Due to the constant amplitude characteristic of the CAZAC sequence, the transmitted signal waveform has a lower peak value and average power ratio, which can ensure that the power of the transmitted signal falls within the linearity of the power amplifier. Within the range, the requirements for the power amplifier of the transmitting end are relatively low, which can reduce the cost and power consumption of the user terminal equipment; and the frequency domain response of the CAZAC sequence is also constant amplitude, so that the receiving end can fairly estimate the channel fading of each frequency band , without affecting the overall channel estimation performance of the base station because the signal amplitude in individual frequency bands is relatively small.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (17)

1. the resource allocation methods of a reference signal is characterized in that, this method comprises:

In basic frequency hopping bandwidth, distribute code channel for reference signal; And

For the reference signal of at least two code channels is distributed different frequency hopping bandwidth.

2. the method for claim 1 is characterized in that, the sign indicating number sequence that described code channel uses is normal amplitude zero an auto-correlation CAZAC sequence.

3. method as claimed in claim 2 is characterized in that, described CAZAC sequence is for pricking doffer-first Zadoff-Chu basic sequence and/or its cycle shift sequence.

4. the method for claim 1 is characterized in that, the integral multiple that described different frequency hopping bandwidth are basic frequency hopping bandwidth.

5. method as claimed in claim 4 is characterized in that, described basic frequency hopping bandwidth is set in advance by system, or the system dynamics adjustment.

6. the method for claim 1 is characterized in that, described reference signal is the measurement pilot frequency that a plurality of transmitting antennas of user terminal or user terminal are used for channel quality measurement.

7. method as claimed in claim 2 is characterized in that, the described code channel of distributing to different reference signals is dynamic change in time.

8. the launching technique of a reference signal is characterized in that, this method comprises:

Determine the sign indicating number sequence that reference signal is used in basic frequency hopping bandwidth; And

Carry out the frequency hopping transmitted reference signal in the frequency hopping bandwidth of distributing, described frequency hopping bandwidth is that network side is distributed at least two different frequency hopping bandwidth of different reference signals.

9. method as claimed in claim 8 is characterized in that, the sign indicating number sequence that described reference signal is used is normal amplitude zero an auto-correlation CAZAC sequence.

10. method as claimed in claim 9 is characterized in that, described CAZAC sequence is for pricking doffer-first Zadoff-Chu basic sequence and/or its cycle shift sequence.

11. method as claimed in claim 8 is characterized in that, the described reference signal emission cycle is configurable.

12. method as claimed in claim 8 is characterized in that, described reference signal is carried out the frequency hopping emission by the specific frequency-hopping mode in sub-district.

13. method as claimed in claim 8 is characterized in that, carries out the frequency hopping emission on the partial-band of described reference signal in the frequency hopping bandwidth.

14. the resource allocation device of a reference signal is characterized in that, this device comprises code channel distribution module and frequency hopping bandwidth allocation module,

Described code channel distribution module is used for distributing code channel for reference signal in basic frequency hopping bandwidth;

Described frequency hopping bandwidth allocation module is used to the reference signal of at least two described distribution code channels to distribute different frequency hopping bandwidth.

15. device as claimed in claim 14 is characterized in that, the sign indicating number sequence of described code channel is normal amplitude zero an auto-correlation CAZAC sequence.

16. the emitter of a reference signal is characterized in that, this device comprises yard a sequence determination module and a transmitter module,

Described sign indicating number sequence determination module is used for the sign indicating number sequence of determining that reference signal is used in basic frequency hopping bandwidth;

Described transmitter module is used for taking place frequently at the frequency hopping bandwidth introskip that distributes and penetrates reference signal, and described frequency hopping bandwidth is that network side is distributed at least two different frequency hopping bandwidth of different reference signals.

17. device as claimed in claim 16 is characterized in that, the sign indicating number sequence of described code channel is normal amplitude zero an auto-correlation CAZAC sequence.

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