CN102299735A - Method for decreasing bandwidth of Ir interface and distributed base station - Google Patents
Method for decreasing bandwidth of Ir interface and distributed base station Download PDFInfo
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Abstract
The invention provides a method for decreasing the bandwidth of an Ir interface, and the method is applied to a remote baseband system. The method comprises the following steps that: in downlink transmission, a BBU carries out bit-grade transmission processing on downlink data and transmits the downlink data subjected to the bit-grade transmission processing to an RRU (remote radio unit) by virtue of the Ir interface; the RRU carries out symbol-grade transmission processing on the received downlink data; in uplink reception, the RRU carries out symbol-grade reception processing on received uplink data and transmits the uplink data subjected to the symbol-grade reception processing to the BBU by virtue of the Ir interface; and the BBU carries out bit-grade reception processing on the received uplink data. The invention further provides a distributed base station. By the application of the method and the distributed base station, the bandwidth requirement of the Ir interface can be reduced greatly so as to decrease the transmission cost of the Ir interface.
Description
Technical field
The present invention relates to the baseband extension systems technology, particularly a kind of method and distributed base station that reduces the Ir interface bandwidth.
Background technology
Existing TD-LTE (time division multiplexing LTE) system adopts the base station architecture of the baseband extension of BBU+RRU (indoor baseband processing unit+Remote Radio Unit), BBU is responsible for Base-Band Processing, master control transmission etc., RRU is responsible for digital intermediate frequency, radio frequency processing, adopt the Optical Fiber Transmission digital baseband signal between BBU and the RRU, the interface between BBU and the RRU is called the Ir interface.The framework of this base station as shown in Figure 1.
Base-Band Processing comprises that bit-level is handled and symbol level is handled two parts.According to uplink and downlink, Base-Band Processing can be divided into base band again and send processing and two parts of base band reception processing.Process of transmitting with PDSCH among the TD-LTE (Physical Downlink Shared Channel) is an example below, illustrates that the base band of existing BBU side sends processing procedure.The base band process of transmitting schematic diagram of BBU side PDSCH among the existing TD-LTE of Fig. 2.Referring to Fig. 2, this base band sends to handle and comprises two parts: bit-level processing section and symbol level processing section.Wherein:
The bit-level processing section comprises: CRC adds module, code block is cut apart and add CRC module, channel coding module, rate-matched module, code block cascade module and bit scramble module.
The symbol level processing section comprises: modulation module, layer mapping block, precoding module, frequency domain wave beam forming module, be used for finishing the resource mapping block of time-frequency mapping and the OFDM symbol generation module that is used to finish the IFFT+CP function jointly with other channels and signal.
In the existing BBU+RRU base station architecture, the Ir interface will transmit the base band data at C point place as shown in the figure.Because 3GPP has introduced the wave beam forming of LTE, the antenna form is mainly 8 passage dual-polarization intelligent antennas, the Ir interface need transmit the base band data of 8 passages, the Ir interface is by I/Q two-way transmission base band data, every circuit-switched data is represented with 16bit, signaling and the coding expense of considering the Ir interface account for 20%, and therefore, the required Ir interface bandwidth in TD-LTE sector that bandwidth is 20MHz is calculated as follows:
Ir interface bandwidth=30.72MHz (sampling rate) * 8 (antenna number) * 16 (sampling precision) * 2 (I/Q two-way)/80% (efficiency of transmission)/1ms=9.8304Gbps
In order to make TD-LTE have the suitable performance with FDD LTE (frequency division multiplexing LTE), a sub-district needs the carrier wave of 2 20MHz band width configuration, and therefore, the TD-LTE sector of such one 2 carrier wave needs the Ir interface bandwidth of nearly 20Gbps.
By as seen above-mentioned, in the existing baseband extension system, high-speed data transmission causes the optical interface cost, increases considerably with the chip cost of Interface Matching, transmission cost etc., seriously reduced the cost performance of equipment, therefore, the problem that how to reduce the Ir interface bandwidth has become one of emphasis problem that each operator and equipment manufacturers pay close attention to.
Summary of the invention
The invention provides a kind of method and distributed base station of the Ir of reduction interface bandwidth, be applied in the baseband extension system, to reduce the transmission cost of Ir interface.
A kind of method that reduces the Ir interface bandwidth provided by the invention is applied to the baseband extension system, comprising:
When descending transmission, indoor baseband processing unit BBU carries out bit-level to downlink data and sends processing, and will carry out the downlink data of bit-level after send handling by the Ir interface and send to radio frequency remote unit RRU, RRU carries out symbol level to received downlink data and sends and handle;
When up reception, RRU carries out symbol level to received upstream data receive to be handled, and will carry out the upstream data that symbol level receives after handling by the Ir interface and send to BBU, and BBU carries out bit-level to received upstream data and receives and handle.
In the said method, the described bit-level of carrying out send to be handled and specifically to be comprised:
Downlink data is added cyclic redundancy code CRC;
Carry out code block and cut apart and add CRC adding downlink data after the CRC;
Code-aiming block is cut apart and is added CRC downlink data afterwards and carry out chnnel coding;
Downlink data after the chnnel coding is carried out rate-matched;
Downlink data after the rate-matched is carried out the code block cascade;
Downlink data after the code-aiming block cascade carries out bit scramble, obtains carrying out bit-level and sends processing downlink data afterwards.
In the said method, the described symbol level that carries out send to be handled and specifically to be comprised:
Modulate carrying out bit-level transmission processing downlink data afterwards;
Downlink data after the modulation is carried out layer mapping;
Downlink data after the layer mapping is carried out precoding;
Downlink data after the precoding is carried out the frequency domain wave beam forming;
The channel of the downlink data after the frequency domain wave beam forming and other channels is carried out the running time-frequency resource mapping jointly;
Running time-frequency resource is shone upon downlink data afterwards carry out fast adverse Fourier transform, and add Cyclic Prefix, obtain carrying out symbol level and send processing downlink data afterwards.
In the said method, the described symbol level that carries out receive to be handled and specifically to be comprised:
The upstream data that receives is removed Cyclic Prefix, carry out fast fourier transform afterwards, obtain up frequency domain data;
Up frequency domain data is separated the subcarrier mapping, obtain each up channel and upward signal; Wherein, up channel comprises: Physical Uplink Control Channel and Physical Uplink Shared Channel, and upward signal comprises: interception reference signal and uplink demodulation reference signal;
Carry out channel estimating according to the upward signal of separating after subcarrier shines upon; Wherein, the result of the channel estimating of use interception reference signal calculates the weighting matrix of down beam shaping, uses the result of the channel estimating of uplink demodulation reference signal that up channel is carried out equilibrium;
Physical Uplink Control Channel after the equilibrium is carried out despreading, demodulation, Physical Uplink Shared Channel after the equilibrium is carried out demodulation, obtain symbol level and receive processing upstream data afterwards, described upstream data comprises: the data of ascending control channel and the data of Uplink Shared Channel.
In the said method, the described bit-level of carrying out receive to be handled and specifically to be comprised:
Carry out channel decoding to carrying out symbol level reception processing ascending control channel afterwards, obtain bit-level and receive the processing first upload control data afterwards; Carry out descrambling to carrying out symbol level reception processing Uplink Shared Channel afterwards;
Uplink Shared Channel behind the descrambling is separated channel interleaving, obtain replying sign ACK, order indication RI conciliates the upstream data after the channel interleaving;
ACK, RI are deciphered, obtain bit-level and receive the processing second upload control data afterwards; The upstream data of separating after the channel interleaving is carried out demultiplexing, obtain the upstream data behind channel quality indicator (CQI) and the demultiplexing;
CQI is deciphered, obtain the 3rd upload control data after bit-level is handled; Upstream data behind the demultiplexing is carried out the decoding block cascade;
Upstream data after the decoding block cascade is separated rate-matched;
The upstream data of separating after the rate-matched is carried out channel decoding;
Upstream data after the channel decoding is carried out the CRC check of CB piece;
Upstream data after the CRC check is carried out decoding block to be cut apart;
Upstream data after decoding block cut apart carries out the CRC check of TB piece, obtains bit-level and receives uplink business data after handling.
A kind of distributed base station provided by the invention is applied to the baseband extension system, comprising: indoor baseband processing unit BBU and radio frequency remote unit RRU, wherein:
When descending transmission, described BBU is used for that downlink data is carried out bit-level and sends processing, and will carry out the downlink data of bit-level after send handling by the Ir interface and send to described RRU, described RRU is used for that received downlink data is carried out symbol level and sends and handle;
When up reception, described RRU is used for that received upstream data is carried out symbol level and receives processing, and will carry out the upstream data of symbol level after receive handling by the Ir interface and send to BBU, described BBU is used for that received upstream data is carried out bit-level and receives and handle.
Being used among the BBU of above-mentioned distributed base station that downlink data is carried out the module that bit-level send to handle comprises: CRC adds module, code block is cut apart and add CRC module, channel coding module, rate-matched module, code block cascade module and bit scramble module, wherein:
Described CRC adds module, is used for downlink data is added cyclic redundancy code CRC, and is used for sending to code block and cutting apart and add the CRC module adding downlink data after the CRC;
Described code block is cut apart and is added the CRC module, is used for carrying out code block and cutting apart and adds CRC being received from downlink data that CRC adds module, and is used for cutting apart and adding CRC downlink data afterwards and send to channel coding module carrying out code block;
Described channel coding module is used for that code block is cut apart and the downlink data that adds the CRC module carries out chnnel coding to being received from, and the downlink data that is used for carrying out after the chnnel coding sends to the rate-matched module;
Described rate-matched module is used for the downlink data that receives the self-channel coding module is carried out rate-matched, and is used for sending to the code block cascade module with carrying out rate-matched downlink data afterwards;
Described code block cascade module is used for the downlink data that is received from the rate-matched module is carried out the code block cascade, and is used for sending to the bit scramble module with carrying out code block cascade downlink data afterwards;
Described bit scramble module is used for the downlink data that is received from the code block cascade module is carried out bit scramble, obtains carrying out bit-level and sends processing downlink data afterwards, sends to RRU.
Being used among the RRU of above-mentioned distributed base station that downlink data is carried out the module that symbol level send to handle comprises: modulation module, layer mapping block, precoding module, frequency domain wave beam forming module, resource mapping block and OFDM symbol generation module, wherein:
Described modulation module is used for modulating carrying out bit-level transmission processing downlink data afterwards, and is used for the downlink data after the modulation is sent to a layer mapping block;
Described layer of mapping block is used for the downlink data that receives the automodulation module is carried out layer mapping, and is used for sending to precoding module with carrying out layer mapping downlink data afterwards;
Described precoding module is used for the downlink data that is received from layer mapping block is carried out precoding;
Described frequency domain wave beam forming module is used for the downlink data that is received from precoding module is carried out the frequency domain wave beam forming, and is used for sending to the resource mapping block with carrying out frequency domain wave beam forming downlink data afterwards;
Described resource mapping block is used for carrying out the running time-frequency resource mapping jointly with being received from the downlink data of frequency domain wave beam forming module and the channel of other channels, and is used for sending to OFDM symbol generation module with carrying out running time-frequency resource mapping downlink data afterwards;
Described OFDM symbol generation module is used for the downlink data that is received from the resource mapping block is carried out fast adverse Fourier transform, and adds Cyclic Prefix, obtains carrying out symbol level and sends processing downlink data afterwards.
As seen from the above technical solution, in the method and distributed base station of reduction Ir interface bandwidth provided by the invention, bit-level processing capacity in the Base-Band Processing is still realized by BBU, and being moved to RRU, the symbol level processing capacity in the Base-Band Processing goes up realization, thereby, at the up-downgoing Bit data that only need transmit on the Ir interface after bit-level is handled.Technical scheme according to the present invention's proposition, the major part of base band still realizes on BBU, do not change the major function of BBU, and still adopt baseband transmission between BBU and the RRU, the networking advantage that has kept BBU+RRU, the angle that realizes from base band does not need to increase extra chip cost simultaneously.Therefore, adopt technical scheme provided by the present invention can reduce the bandwidth demand of Ir interface greatly, thereby reduce the transmission cost of Ir interface.
Description of drawings
Fig. 1 is the base station architecture schematic diagram of the baseband extension of BBU+RRU in the existing TD-LTE system;
The base band process of transmitting schematic diagram of BBU side PDSCH among the existing TD-LTE of Fig. 2;
Fig. 3 is the schematic diagram of transmitted bit level data between BBU of the present invention and the RRU.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
Main thought of the present invention is: the base station architecture that proposes a kind of bit-level baseband extension, symbol level processing capacity in the Base-Band Processing is moved to RRU from BBU to be realized, make the Ir interface only need transmit the up-downgoing Bit data after bit-level is handled, thereby greatly reduce the bandwidth demand of up-downgoing Ir interface, and then from having reduced equipment cost and transmission cost in essence.
Based on above-mentioned main thought, the invention provides a kind of method of the Ir of reduction interface bandwidth, this method is applied to the baseband extension system, comprises following processing:
When descending transmission, BBU carries out bit-level to downlink data send to be handled, and will carry out the downlink data that bit-level sends after handling by the Ir interface and send to RRU, and RRU carries out symbol level to received downlink data and sends and handle;
When up reception, RRU carries out symbol level to received upstream data receive to be handled, and will carry out the upstream data that symbol level receives after handling by the Ir interface and send to BBU, and BBU carries out bit-level to received upstream data and receives and handle.
In the said method, carry out bit-level transmission processing and specifically can comprise:
Downlink data is added CRC;
Carry out code block and cut apart and add CRC adding downlink data after the CRC;
Code-aiming block is cut apart and is added CRC downlink data afterwards and carry out chnnel coding;
Downlink data after the chnnel coding is carried out rate-matched;
Downlink data after the rate-matched is carried out the code block cascade;
Downlink data after the code-aiming block cascade carries out bit scramble, obtains carrying out bit-level and sends processing downlink data afterwards.
In the said method, carry out symbol level transmission processing and specifically can comprise:
Modulate carrying out bit-level transmission processing downlink data afterwards;
Downlink data after the modulation is carried out layer mapping;
Downlink data after the layer mapping is carried out precoding;
Downlink data after the precoding is carried out the frequency domain wave beam forming;
The channel of the downlink data after the frequency domain wave beam forming and other channels is carried out the running time-frequency resource mapping jointly;
Running time-frequency resource is shone upon downlink data afterwards carry out fast adverse Fourier transform, and add Cyclic Prefix, obtain carrying out symbol level and send processing downlink data afterwards.
In the said method, carry out symbol level reception processing and specifically can comprise:
The upstream data that receives is removed Cyclic Prefix, carry out fast fourier transform afterwards, obtain up frequency domain data;
Up frequency domain data is separated the subcarrier mapping, obtain each up channel and upward signal; Wherein, up channel comprises: Physical Uplink Control Channel and Physical Uplink Shared Channel, and upward signal comprises: interception reference signal and uplink demodulation reference signal;
Carry out channel estimating according to the upward signal of separating after subcarrier shines upon; Wherein, the result of the channel estimating of use interception reference signal calculates the weighting matrix of down beam shaping, uses the result of the channel estimating of uplink demodulation reference signal that up channel is carried out equilibrium;
Physical Uplink Control Channel after the equilibrium is carried out despreading, demodulation, Physical Uplink Shared Channel after the equilibrium is carried out demodulation, obtain symbol level and receive processing upstream data afterwards, described upstream data comprises: the data of ascending control channel and the data of Uplink Shared Channel.
In the said method, carry out bit-level reception processing and specifically can comprise:
Carry out channel decoding to carrying out symbol level reception processing ascending control channel afterwards, obtain bit-level and receive the processing first upload control data afterwards; Carry out descrambling to carrying out symbol level reception processing Uplink Shared Channel afterwards;
Uplink Shared Channel behind the descrambling is separated channel interleaving, obtain replying sign ACK, order indication RI conciliates the upstream data after the channel interleaving;
ACK, RI are deciphered, obtain bit-level and receive the processing second upload control data afterwards; The upstream data of separating after the channel interleaving is carried out demultiplexing, obtain the upstream data behind channel quality indicator (CQI) and the demultiplexing;
CQI is deciphered, obtain the 3rd upload control data after bit-level is handled; Upstream data behind the demultiplexing is carried out the decoding block cascade;
Upstream data after the decoding block cascade is separated rate-matched;
The upstream data of separating after the rate-matched is carried out channel decoding;
Upstream data after the channel decoding is carried out the CRC check of CB piece;
Upstream data after the CRC check is carried out decoding block to be cut apart;
Upstream data after decoding block cut apart carries out the CRC check of TB piece, obtains bit-level and receives uplink business data after handling.
Based on above-mentioned main thought, the present invention also provides a kind of distributed base station, is applied to the baseband extension system, and this base station comprises: BBU and RRU, wherein:
When descending transmission, BBU is used for that downlink data is carried out bit-level send to be handled, and will carry out the downlink data that bit-level sends after handling by the Ir interface and send to RRU, and RRU is used for that received downlink data is carried out symbol level and sends and handle;
When up reception, RRU is used for that received upstream data is carried out symbol level and receives processing, and will carry out the upstream data of symbol level after receive handling by the Ir interface and send to BBU, BBU is used for that received upstream data is carried out bit-level and receives and handle.
Being used among the BBU of above-mentioned distributed base station that downlink data is carried out the module that bit-level send to handle comprises: CRC adds module, code block is cut apart and add CRC module, channel coding module, rate-matched module, code block cascade module and bit scramble module, wherein:
CRC adds module, is used for downlink data is added cyclic redundancy code CRC, and is used for sending to code block and cutting apart and add the CRC module adding downlink data after the CRC;
Code block is cut apart and is added the CRC module, is used for carrying out code block and cutting apart and adds CRC being received from downlink data that CRC adds module, and is used for cutting apart and adding CRC downlink data afterwards and send to channel coding module carrying out code block;
Channel coding module is used for that code block is cut apart and the downlink data that adds the CRC module carries out chnnel coding to being received from, and the downlink data that is used for carrying out after the chnnel coding sends to the rate-matched module;
The rate-matched module is used for the downlink data that receives the self-channel coding module is carried out rate-matched, and is used for sending to the code block cascade module with carrying out rate-matched downlink data afterwards;
The code block cascade module is used for the downlink data that is received from the rate-matched module is carried out the code block cascade, and is used for sending to the bit scramble module with carrying out code block cascade downlink data afterwards;
The bit scramble module is used for the downlink data that is received from the code block cascade module is carried out bit scramble, obtains carrying out bit-level and sends processing downlink data afterwards, sends to RRU.
Being used among the RRU of above-mentioned distributed base station that downlink data is carried out the module that symbol level send to handle comprises: modulation module, layer mapping block, precoding module, frequency domain wave beam forming module, resource mapping block and OFDM symbol generation module, wherein:
Modulation module is used for modulating carrying out bit-level transmission processing downlink data afterwards, and is used for the downlink data after the modulation is sent to a layer mapping block;
Layer mapping block is used for the downlink data that receives the automodulation module is carried out layer mapping, and is used for sending to precoding module with carrying out a layer mapping downlink data afterwards;
Precoding module is used for the downlink data that is received from layer mapping block is carried out precoding;
Frequency domain wave beam forming module is used for the downlink data that is received from precoding module is carried out the frequency domain wave beam forming, and is used for sending to the resource mapping block with carrying out frequency domain wave beam forming downlink data afterwards;
The resource mapping block is used for carrying out the running time-frequency resource mapping jointly with being received from the downlink data of frequency domain wave beam forming module and the channel of other channels, and is used for sending to OFDM symbol generation module with carrying out running time-frequency resource mapping downlink data afterwards;
OFDM symbol generation module is used for the downlink data that is received from the resource mapping block is carried out fast adverse Fourier transform, and adds Cyclic Prefix, obtains carrying out symbol level and sends processing downlink data afterwards.
Below in conjunction with Fig. 2, with the advantage of concrete data declaration the present invention to saving Ir interface bandwidth.The present invention fixes tentatively following hypothesis (the concrete data shown in the figure are also based on following hypothesis):
1, the system bandwidth of TD-LTE is 20MHz;
2, current subframe PDCCH takies an OFDM symbol, and does not transmit PBCH (Physical Broadcast Channel), synchronizing signal, and current like this subframe all can be used as transmission PDSCH channel except first OFDM symbol;
3, UE adopts 8 antenna dual-stream beamforming;
4, the CQI=8 of PDSCH (modulation system: 16QAM, encoding rate: 0.4785), N
PRB=100 (cover all bandwidth, account for Ir interface transmission valid data 90%), I
TBS=13, TB
Size=25456bit, MCS=14.Wherein, CQI is a CQI, N
PRBThe number of the Physical Resource Block that expression takies, I
TBSThe indication of expression transmission block size, TB
SizeExpression transmission block size, MCS is a modulation coding mode.
As previously mentioned, in the existing BBU+RRU base station architecture, the Ir interface will transmit the base band data at C point place as shown in the figure, need the Ir interface bandwidth of nearly 10Gbps.
The present invention is placed on RRU with the symbol level processing section and goes up realization, therefore, the Ir interface will transmit the base band Bit data at B point place as shown in Figure 2, consider that the expense of control channel and reference signal accounts for 10%, the Ir interface bandwidth is calculated as follows when therefore, adopting technical solution of the present invention:
Ir interface bandwidth=52.8MHz (sampling rate) * 2 (I/Q two-way)/90%/80%/1ms=0.1467Gbps
By above-mentioned contrast as can be seen: the present invention sends symbol level processing section in the processing procedure with base band and moves to RRU and go up and realize, will reduce Ir downstream interface bandwidth greatly, and the reduction ratio is up to 98.5%, thereby reduces interface and transmission cost greatly.Equally, the symbol level processing section that base band is received in the processing procedure moves to the RRU realization, and Ir upstream Interface bandwidth also will reduce greatly.
Therefore, the base station architecture that the present invention proposes is: finish the bit-level transmitting-receiving processing capacity of base band on BBU, promptly finish as shown in Figure 2 the A point on the BBU to the Base-Band Processing function between the B point; On RRU, finish the symbol level transmitting-receiving processing capacity of base band, promptly finish the Base-Band Processing function between the B point and C point as shown in Figure 2 on the RRU.Transmitted bit level data between BBU and the RRU, as shown in Figure 3.
Because the symbol level processing section moves to RRU and goes up realization, therefore in example shown in Figure 3, need to transmit following information between BBU and the RRU:
1, the data after the PDSCH bit-level of descending each UE is handled;
2, the data after descending PBCH bit-level is handled;
3, the data (comprising PDCCH, PHICH, PCFICH) after the down control channel bit-level is handled;
4, the data after descending PMCH bit-level is handled;
5, the data after the PUSCH symbol level of up each UE is handled;
6, the data after up PUCCH symbol level is handled;
7, PRACH symbol level detection result;
8, the control signaling between BBU and the RRU is mutual.
In description of the invention, uplink user data and upload control data are referred to as upstream data, down user data and descending control data are referred to as downlink data.
As seen from the above technical solution, in the method and distributed base station of reduction Ir interface bandwidth provided by the invention, bit-level processing capacity in the Base-Band Processing is still realized by BBU, and being moved to RRU, the symbol level processing capacity in the Base-Band Processing goes up realization, thereby, in the up-downgoing data that only need transmit on the Ir interface after bit-level is handled.Technical scheme according to the present invention's proposition, the major part of base band still realizes on BBU, do not change the major function of BBU, and still adopt baseband transmission between BBU and the RRU, the networking advantage that has kept BBU+RRU, the angle that realizes from base band does not need to increase extra chip cost simultaneously.Therefore, adopt technical scheme provided by the present invention can reduce the bandwidth demand of Ir interface greatly, thereby reduce the transmission cost of Ir interface.
Above-mentioned distributed base station framework based on the present invention's proposition, BBU finishes the bit-level processing capacity in master control processing, the Base-Band Processing, symbol level processing capacity during RRU finishes in radio frequency processing and the Base-Band Processing, the Bit data between superfine processing of Ir interface transfer ratio and symbol level are handled.
In the above example, the TD-LTE system is an example, and the framework of the distributed base station that bit-level that the present invention proposes zooms out has been described, but the scope of application of the present invention is not limited thereto, and the present invention is equally applicable to the FDD-LTE system, TD-SCDMA system of other baseband extensions etc.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (8)
1. a method that reduces the Ir interface bandwidth is applied to the baseband extension system, it is characterized in that:
When descending transmission, indoor baseband processing unit BBU carries out bit-level to downlink data and sends processing, and will carry out the downlink data of bit-level after send handling by the Ir interface and send to radio frequency remote unit RRU, RRU carries out symbol level to received downlink data and sends and handle;
When up reception, RRU carries out symbol level to received upstream data receive to be handled, and will carry out the upstream data that symbol level receives after handling by the Ir interface and send to BBU, and BBU carries out bit-level to received upstream data and receives and handle.
2. method according to claim 1 is characterized in that, the described bit-level of carrying out send to be handled and to be comprised:
Downlink data is added cyclic redundancy code CRC;
Carry out code block and cut apart and add CRC adding downlink data after the CRC;
Code-aiming block is cut apart and is added CRC downlink data afterwards and carry out chnnel coding;
Downlink data after the chnnel coding is carried out rate-matched;
Downlink data after the rate-matched is carried out the code block cascade;
Downlink data after the code-aiming block cascade carries out bit scramble, obtains carrying out bit-level and sends processing downlink data afterwards.
3. method according to claim 1 is characterized in that, the described symbol level that carries out send to be handled and to be comprised:
Modulate carrying out bit-level transmission processing downlink data afterwards;
Downlink data after the modulation is carried out layer mapping;
Downlink data after the layer mapping is carried out precoding;
Downlink data after the precoding is carried out the frequency domain wave beam forming;
The channel of the downlink data after the frequency domain wave beam forming and other channels is carried out the running time-frequency resource mapping jointly;
Running time-frequency resource is shone upon downlink data afterwards carry out fast adverse Fourier transform, and add Cyclic Prefix, obtain carrying out symbol level and send processing downlink data afterwards.
4. method according to claim 1 is characterized in that, the described symbol level that carries out receive to be handled and to be comprised:
The upstream data that receives is removed Cyclic Prefix, carry out fast fourier transform afterwards, obtain up frequency domain data;
Up frequency domain data is separated the subcarrier mapping, obtain each up channel and upward signal; Wherein, up channel comprises: Physical Uplink Control Channel and Physical Uplink Shared Channel, and upward signal comprises: interception reference signal and uplink demodulation reference signal;
Carry out channel estimating according to the upward signal of separating after subcarrier shines upon; Wherein, the result of the channel estimating of use interception reference signal calculates the weighting matrix of down beam shaping, uses the result of the channel estimating of uplink demodulation reference signal that up channel is carried out equilibrium;
Physical Uplink Control Channel after the equilibrium is carried out despreading, demodulation, Physical Uplink Shared Channel after the equilibrium is carried out demodulation, obtain symbol level and receive processing upstream data afterwards, described upstream data comprises: the data of ascending control channel and the data of Uplink Shared Channel.
5. method according to claim 4 is characterized in that, the described bit-level of carrying out receive to be handled and to be comprised:
Carry out channel decoding to carrying out symbol level reception processing ascending control channel afterwards, obtain bit-level and receive the processing first upload control data afterwards; Carry out descrambling to carrying out symbol level reception processing Uplink Shared Channel afterwards;
Uplink Shared Channel behind the descrambling is separated channel interleaving, obtain replying sign ACK, order indication RI conciliates the upstream data after the channel interleaving;
ACK, RI are deciphered, obtain bit-level and receive the processing second upload control data afterwards; The upstream data of separating after the channel interleaving is carried out demultiplexing, obtain the upstream data behind channel quality indicator (CQI) and the demultiplexing;
CQI is deciphered, obtain the 3rd upload control data after bit-level is handled; Upstream data behind the demultiplexing is carried out the decoding block cascade;
Upstream data after the decoding block cascade is separated rate-matched;
The upstream data of separating after the rate-matched is carried out channel decoding;
Upstream data after the channel decoding is carried out the CRC check of CB piece;
Upstream data after the CRC check is carried out decoding block to be cut apart;
Upstream data after decoding block cut apart carries out the CRC check of TB piece, obtains bit-level and receives uplink business data after handling.
6. a distributed base station is applied to the baseband extension system, comprising: indoor baseband processing unit BBU and radio frequency remote unit RRU is characterized in that:
When descending transmission, described BBU is used for that downlink data is carried out bit-level and sends processing, and will carry out the downlink data of bit-level after send handling by the Ir interface and send to described RRU, described RRU is used for that received downlink data is carried out symbol level and sends and handle;
When up reception, described RRU is used for that received upstream data is carried out symbol level and receives processing, and will carry out the upstream data of symbol level after receive handling by the Ir interface and send to BBU, described BBU is used for that received upstream data is carried out bit-level and receives and handle.
7. distributed base station according to claim 6, it is characterized in that, being used among the BBU that downlink data is carried out the module that bit-level send to handle comprises: CRC adds module, code block is cut apart and add CRC module, channel coding module, rate-matched module, code block cascade module and bit scramble module, wherein:
Described CRC adds module, is used for downlink data is added cyclic redundancy code CRC, and is used for sending to code block and cutting apart and add the CRC module adding downlink data after the CRC;
Described code block is cut apart and is added the CRC module, is used for carrying out code block and cutting apart and adds CRC being received from downlink data that CRC adds module, and is used for cutting apart and adding CRC downlink data afterwards and send to channel coding module carrying out code block;
Described channel coding module is used for that code block is cut apart and the downlink data that adds the CRC module carries out chnnel coding to being received from, and the downlink data that is used for carrying out after the chnnel coding sends to the rate-matched module;
Described rate-matched module is used for the downlink data that receives the self-channel coding module is carried out rate-matched, and is used for sending to the code block cascade module with carrying out rate-matched downlink data afterwards;
Described code block cascade module is used for the downlink data that is received from the rate-matched module is carried out the code block cascade, and is used for sending to the bit scramble module with carrying out code block cascade downlink data afterwards;
Described bit scramble module is used for the downlink data that is received from the code block cascade module is carried out bit scramble, obtains carrying out bit-level and sends processing downlink data afterwards, sends to RRU.
8. distributed base station according to claim 6, it is characterized in that, being used among the RRU that downlink data is carried out the module that symbol level send to handle comprises: modulation module, layer mapping block, precoding module, frequency domain wave beam forming module, resource mapping block and OFDM symbol generation module, wherein:
Described modulation module is used for modulating carrying out bit-level transmission processing downlink data afterwards, and is used for the downlink data after the modulation is sent to a layer mapping block;
Described layer of mapping block is used for the downlink data that receives the automodulation module is carried out layer mapping, and is used for sending to precoding module with carrying out layer mapping downlink data afterwards;
Described precoding module is used for the downlink data that is received from layer mapping block is carried out precoding;
Described frequency domain wave beam forming module is used for the downlink data that is received from precoding module is carried out the frequency domain wave beam forming, and is used for sending to the resource mapping block with carrying out frequency domain wave beam forming downlink data afterwards;
Described resource mapping block is used for carrying out the running time-frequency resource mapping jointly with being received from the downlink data of frequency domain wave beam forming module and the channel of other channels, and is used for sending to OFDM symbol generation module with carrying out running time-frequency resource mapping downlink data afterwards;
Described OFDM symbol generation module is used for the downlink data that is received from the resource mapping block is carried out fast adverse Fourier transform, and adds Cyclic Prefix, obtains carrying out symbol level and sends processing downlink data afterwards.
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