CN106535255A - Method and device for resource scheduling and control based on C-RAN - Google Patents

Abstract

The invention discloses a C-RAN-based resource scheduling and control method and device, the method comprising: the BBU pool activates the RRU by periodically sending a short pulse sequence on a wavelength-dedicated control channel; the BBU pool activates the RRU , by broadcasting the synchronization information and system information to the air interface, so that the user terminal obtains the synchronization information and system information, so that the user terminal and the cell corresponding to the BBU pool realize downlink synchronization; and then the user terminal realizes downlink synchronization with the cell through random The access process establishes a connection with the cell and realizes uplink synchronization; after the user terminal and the cell realize downlink synchronization and uplink synchronization, within a scheduling period, the BBU pool allocates wireless bandwidth resources for the user terminal according to the buffer status report BSR sent by the user terminal; The BBU pool allocates optical wavelength bandwidth resources to the RRU according to the sum of the bandwidth request sizes of all user terminals corresponding to the RRU. The device is used to implement the method.

Description

A resource scheduling and control method and device based on C-RAN

technical field

The present invention relates to the field of wireless communication, in particular to a MAC layer resource scheduling and control method and device based on analog optical radio frequency C-RAN.

Background technique

With the development of next-generation wireless networks, 5G is shifting towards larger capacity, higher speed and ultra-dense deployment, and as a converged network, 5G needs to provide support for 2G/3G/LTE and WIFI to provide a seamless coverage structure. Dense network deployment poses great challenges to cost and energy consumption and flexible network management and control. C-RAN is an effective solution to this (refer to China Mobile's white paper). C-RAN is a wireless access network solution based on Centralized Processing, Collaborative Radio and Real-time Cloud Infrastructure. Between the BBU POOL (BBU, Base Band Unit, baseband unit) and the RRU (Remote Radio Unit, remote radio unit), WDM (Wavelength Division Multiplexing, wavelength division multiplexing) is used for signal transmission.

Figure 1 is a schematic diagram of the network structure of C-RAN. Refer to Figure 1. Compared with the traditional mobile network architecture, in C-RAN, the BBU is placed centrally and moved up to the edge nodes of the metropolitan area to form a BBU pool, which is connected to the remote radio frequency. Unit (RRU), the BBU pool acts as a Super BBU and cloud center controller, integrating the functions of the BBU in the traditional mobile network and the OLT (Optical Line Terminal, optical line terminal) of the traditional PON (Passive Optical Network, passive optical network) ) related functions, which can realize wireless baseband signal processing and optical signal processing, resource control and scheduling functions.

Figure 2 is a schematic diagram of the functions of the BBU pool and the RRU. Refer to Figure 2. The transmission mode uses analog optical radio frequency. In order to reduce costs, the ADC/DAC function is also moved to the BBU pool, which means that the remote radio frequency unit connected to the BBU pool (RRU) is only responsible for radio frequency functions and low-rate optical baseband signal processing, thereby significantly reducing the huge cost and energy consumption caused by dense network deployment, and realizing low-latency transmission of signals. Considering that when the frequency of radio frequency signals is high, Such as 5GHz or even 60GHz, due to its radio frequency attenuation characteristics, this solution is especially suitable for dense coverage scenarios with large capacity and short distance.

The centralized baseband pool has natural advantages in deploying cloud computing, multi-controller coordinated scheduling, and SDN/NFV. The characteristics of the simulated fronthaul network enable transparent transmission of signals at the remote radio frequency unit, and optical and wireless baseband processing And control is done in the centralized baseband pool.

Under the above network architecture, the central controller (Central Controller) in the BBU pool is responsible for allocating wavelengths to RRUs and allocating wireless time-frequency resource blocks to user terminals (UEs). Resource scheduling is directly performed by user terminals and the central controller. The negotiation is completed, but the RRU does not participate in the scheduling work. To enable each RRU to tune to a different assigned wavelength, each RRU has a tunable optical transceiver. The central controller allocates all uplink and downlink wavelength pairs, {λ ₁ ,λ′ ₁ },{λ ₂ ,λ′ ₂ }…{λn,λ′n}, for the data between the user terminal UE and the BBU pool Transmission and control signaling transmission. In addition, for the signaling transmission between RRU and BBU pool (topology maintenance, RRU clock synchronization, wavelength tuning notification, etc.), the short optical baseband pulse sequence is transmitted in a low-rate baseband dedicated channel {λc,λ′c} Finish. The realization of dynamic wavelength allocation is through the real-time wavelength selection of RRU. Figure 3 is a schematic diagram of the structure and function of RRU. Referring to Figure 3, data of different wavelengths are transmitted on a backbone optical fiber, which reaches each RRU through an optical coupler. The RRU can obtain the wavelengths λc and λ'c through the tunable wavelength filter. The first tunable wavelength filter needs to filter out λc and its corresponding control information, and then the RRU generates the downlink signaling signal control signal through the optical receiver PD. The second tunable wavelength filter only needs to filter out the uplink control wavelength λ'c, which is used to modulate the uplink signaling signal control signal. After the wavelength is modulated with data, it will pass through an optical isolator, and finally enter the trunk light through the optical coupler, and return to the central controller.

At the same time, a low-speed baseband signal is modulated on the wavelength λc to control the tuning of the wavelength, and the signal is decoded by a micro-control circuit to control the tunable wavelength filter. After the RRU is assigned a wavelength, the RRU will adjust the tunable filter to the assigned wavelength pair λ _i , λ′ _i through the above control signal, and start data communication.

However, most of the current analog fronthaul solutions in this field focus on the physical layer, and there are relatively few studies on the MAC (Media Access Control, Media Access Control) layer. The existing MAC layer has problems such as low utilization of BBU pool resources and unbalanced load.

Therefore, it is of great significance to propose a method that can realize reasonable allocation and flexible scheduling of resources at the MAC layer based on analog radio frequency over optical C-RAN.

Contents of the invention

Aiming at the defects in the prior art, embodiments of the present invention provide a C-RAN-based resource scheduling and control method and device.

On the one hand, the embodiment of the present invention proposes a method for scheduling and controlling MAC layer resources based on C-RAN, the method including:

The baseband unit BBU pool activates the remote radio frequency unit RRU by periodically sending short pulse sequences on the wavelength-dedicated control channel;

After the BBU pool activates the RRU, it broadcasts the synchronization information and system information to the air interface, so that the user terminal obtains the synchronization information and system information, so that the user terminal and the cell corresponding to the BBU pool realize Downlink synchronization; further enabling the user terminal to establish a connection with the cell through a random access procedure after realizing downlink synchronization with the cell and realize uplink synchronization;

After the user terminal and the cell realize downlink synchronization and uplink synchronization, within a scheduling period, the BBU pool allocates wireless bandwidth resources for the user terminal according to the buffer status report BSR sent by the user terminal; at the same time, The BBU pool allocates optical wavelength bandwidth resources for the RRU according to the sum of bandwidth request sizes of all the user terminals corresponding to the RRU.

The resource scheduling and control method based on C-RAN provided by the present invention can allocate wireless resources according to the actual needs of user terminals, and at the same time allocate optical bandwidth resources to RRU according to the bandwidth request size of user terminals, greatly reducing signaling Interactive processes, thereby reducing delays. Therefore, reasonable allocation and flexible scheduling of MAC layer resources based on the simulated radio frequency over optical C-RAN can be realized, thereby solving problems such as tidal effects and low resource utilization.

On the other hand, the embodiment of the present invention also proposes a resource scheduling and control device based on C-RAN, the device includes:

The RRU activation module is used to enable the baseband unit BBU pool to activate the remote radio frequency unit RRU by periodically sending short pulse sequences on the wavelength-specific control channel;

a synchronization module, configured to enable the BBU pool to broadcast synchronization information and system information to the air interface after activating the RRU, so that the user terminal obtains the synchronization information and system information, so that the user terminal and the The cell corresponding to the BBU pool realizes downlink synchronization; and then enables the user terminal to establish a connection with the cell through a random access process after realizing downlink synchronization with the cell and realize uplink synchronization

The resource allocation module is configured to enable the user terminal to achieve downlink synchronization and uplink synchronization with the cell, and within a scheduling period, the BBU pool provides the user terminal with the buffer status report BSR sent by the user terminal Allocating wireless bandwidth resources; at the same time, the BBU pool allocates optical wavelength bandwidth resources for the RRU according to the sum of the bandwidth request sizes of all the user terminals corresponding to the RRU. .

The resource scheduling and control device based on C-RAN provided by the present invention can allocate wireless resources according to the actual needs of user terminals, and at the same time allocate optical bandwidth resources to RRU according to the bandwidth request size of user terminals, greatly reducing signaling Interactive processes, thereby reducing delays. Therefore, reasonable allocation and flexible scheduling of MAC layer resources based on the simulated radio frequency over optical C-RAN can be realized, thereby solving problems such as tidal effects and low resource utilization.

Description of drawings

FIG. 1 is a schematic diagram of a network structure of a C-RAN;

Figure 2 is a functional schematic diagram of the BBU pool and the RRU;

FIG. 3 is a schematic diagram of the structure and functions of the RRU;

FIG. 4 is a schematic flowchart of an embodiment of a resource scheduling and control method based on C-RAN in the present invention;

FIG. 5 is a schematic flow diagram of activating RRU in an embodiment of the C-RAN-based resource scheduling and control method of the present invention;

6 is a schematic flow diagram of a user terminal randomly accessing a cell in an embodiment of a C-RAN-based resource scheduling and control method according to the present invention;

FIG. 7 is a schematic flow diagram of the data transmission performed by the BBU pool to the RRU and the user terminal in the embodiment of the C-RAN-based resource scheduling and control method of the present invention;

FIG. 8 is a schematic structural diagram of an embodiment of a C-RAN-based resource scheduling and control device according to the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

FIG. 4 is a schematic flowchart of an embodiment of a C-RAN-based resource scheduling and control method according to the present invention. Referring to FIG. 4 , this embodiment discloses a C-RAN-based resource scheduling and control method, including:

S1. The baseband unit BBU pool activates the remote radio frequency unit RRU by periodically sending short pulse sequences on the wavelength-dedicated control channel;

S2. After activating the RRU, the BBU pool broadcasts synchronization information and system information to the air interface, so that the user terminal obtains the synchronization information and system information, so that the user terminal corresponds to the BBU pool The cell realizes downlink synchronization; and then enables the user terminal to establish a connection with the cell through a random access procedure after realizing downlink synchronization with the cell and realize uplink synchronization;

S3. After the user terminal and the cell realize downlink synchronization and uplink synchronization, within a scheduling period, the BBU pool allocates wireless bandwidth resources for the user terminal according to the buffer status report BSR sent by the user terminal; At the same time, the BBU pool allocates optical wavelength bandwidth resources to the RRU according to the sum of bandwidth request sizes of all the user terminals corresponding to the RRU.

The resource scheduling and control method based on C-RAN provided by the present invention can allocate wireless resources according to the actual needs of user terminals, and at the same time allocate optical bandwidth resources to RRU according to the bandwidth request size of user terminals, greatly reducing signaling Interactive processes, thereby reducing delays. Therefore, reasonable allocation and flexible scheduling of MAC layer resources based on the simulated radio frequency over optical C-RAN can be realized, thereby solving problems such as tidal effects and low resource utilization.

In the above embodiment, the RRUs share a wavelength through OFDM, and the BBU pool can dynamically allocate wavelengths according to the bandwidth request of the user terminal or the number of users of different RRUs: allocate more subcarriers to the hotspot RRU, and at the same time Subcarriers with fewer RRUs are allocated to user terminals or have lower bandwidth requirements. In this way, flexible scheduling of wavelength resources is realized, and resource utilization is improved. In step S1, the BBU pool periodically sends a short pulse sequence to the RRU through a wavelength-dedicated control channel;

After receiving the short pulse sequence, the RRU replies a pulse with the same duration as the short pulse sequence to the BBU pool through the uplink control channel;

After receiving the pulse with the same duration as the short pulse sequence, the BBU pool allocates an initial data wavelength pair to the RRU in a polling manner, thereby activating the RRU.

Specifically, FIG. 5 is a schematic flow chart of activating RRU in an embodiment of the resource scheduling and control method based on C-RAN in the present invention. Referring to FIG. 5, in step S1, the BBU pool periodically activates the wavelength dedicated control channel Send a short pulse sequence on λc, if the RRU receives the short pulse sequence, it will reply a pulse with the same duration as the short pulse sequence on the uplink control channel λ'c, so that the BBU pool can know the The existence of the above RRU. Next, the BBU pool allocates an initial data wavelength pair to each of the RRUs in a polling manner, so as to complete the activation of the RRUs.

Wherein, the initial data wavelength pair is used for data transmission between the user terminal and the BBU pool.

In step S2, the BBU pool broadcasts the synchronization information and system information to the air interface, so that the user terminal acquires the synchronization information and system information, so that the downlink synchronization between the user terminal and the cell includes:

The BBU pool sends synchronization information and system information to the RRU through a data wavelength channel, and broadcasts to the air interface so that the user terminal corresponding to the RRU obtains the synchronization information and system information;

The user terminal completes cell identification and retrieves system information according to the synchronization information and the downlink reference signal in the system information, thereby realizing downlink synchronization with the cell and accessing the cell.

FIG. 6 is a schematic flow diagram of a user terminal randomly accessing a cell in an embodiment of a C-RAN-based resource scheduling and control method according to the present invention. Referring to FIG. 6, in step S2, the user terminal communicates with the cell through a random access process The specific steps to establish a connection are:

S21. The user terminal sends a random access prefix on a random access channel (PRACH). The initialization of the random access procedure is initiated by the PDCCH order or the MAC sublayer. The first is the transmission of the random access preamble. The main purpose of this step is that the base station can correctly estimate the transmission delay of the terminal, and solve the conflict problem that multiple users initiate access requests at the same time.

S22. After the base station detects the random access sequence, the MAC layer generates a random access response (RAR), and sends it through the downlink shared channel (PDSCH). The message at least includes the serial number of the received preamble, the time adjustment amount (TA) for uplink transmission, uplink PUSCH scheduling information and allocated temporary C-RNTI.

The feedback information sent by the network side to the terminal includes the transmission delay required for uplink synchronization and the access overload status of the current system (for users to use the backoff mechanism to avoid conflicts). In addition, the network side also feeds back to the terminal the position of the uplink resource allocated for the access user.

S23. The user terminal sends uplink data (PUSCH) according to the scheduling information and TA information carried in the random access response; the message includes the unique ID of the user terminal, namely TMSI. The RRC layer of the user terminal generates an RRC Connection Request.

The user terminal sends its own user identifier C-RNTI on the specified uplink resource.

S24. The base station receives the uplink message of the user terminal, and returns a contention resolution message to the successfully accessed user terminal; the message includes the unique ID (C-RNTI) of the successfully accessed user terminal. RRC ContentionResolution is generated by the RRC layer of the base station. The addressed user terminal detects whether Msg4 contains its own user terminal ID. If yes, reply ACK and consider random access successful; if not, consider competition failure and wait for the next access.

The network side feeds back the conflict resolution information to the user terminal. So far, the random access process will completely solve the conflict problem caused by multiple users requesting to access the system at the same time.

FIG. 7 is a schematic flow diagram of the data transmission process of the BBU pool to the RRU and the user terminal in the embodiment of the C-RAN-based resource scheduling and control method of the present invention. Referring to FIG. 7, in step S3, it should be noted that the scheduling period It can be set in advance, such as 1ms or 2ms, and can also be adjusted adaptively according to business needs. For example, when the business volume is relatively small, the scheduling period can be adjusted to 2ms, and when the business volume is relatively large, the scheduling period can be adjusted to 1ms.

Specifically, the BBU pool assigning wireless resources to the user terminal according to the buffer status report BSR sent by the user terminal includes:

After the BBU pool detects the uplink scheduling request SR (Scheduling Request) sent by the user terminal, it allocates uplink resources for the user terminal, so that the user terminal sends a buffer status report BSR (BufferStaus Report);

The BBU pool allocates radio resources for the user terminal according to the buffer status report BSR sent by the user terminal;

Wherein, the BBU pool can schedule and allocate radio resources for the user terminal according to information such as QoS policy, SINR, strategy allocation policy, and cache size.

The BBU pool sends the wireless resource allocation information to the RRU corresponding to the user terminal, and the RRU corresponding to the user terminal broadcasts the wireless bandwidth resource allocation information to an air interface, so that the user terminal Acquire the wireless resource.

The allocation of optical wavelength bandwidth resources for the RRU by the BBU pool according to the sum of the bandwidth request sizes of all the user terminals corresponding to the RRU includes:

The BBU pool allocates the optical wavelength bandwidth resource to the RRU according to the sum of the bandwidth request sizes of all the user terminals corresponding to the RRU, and transmits the optical wavelength bandwidth resource allocation information through the wavelength-dedicated control channel λc to said RRU;

The RRU tunes to a corresponding wavelength according to the optical wavelength bandwidth resource allocation information.

Specifically, the RRU can decode the corresponding bandwidth allocation information through the low-speed baseband control information processing module, and tune to the corresponding wavelength, so as to realize flexible scheduling of wavelength resources.

Optionally, in the above embodiment, if no user terminal accesses the RRU for a long time, it can only be connected to the wavelength baseband control channel, so as to realize the dormancy of the RRU, and the wavelength baseband control channel is used to carry the signal Signaling controls the signaling of the channel, and temporarily withdraws the data wavelength channel to reduce resource consumption.

Fig. 8 is a schematic structural diagram of an embodiment of a resource scheduling and control device based on C-RAN in the present invention. Referring to Fig. 8, the present invention also proposes a MAC layer resource scheduling and control device based on analog optical radio frequency C-RAN, including: RRU activation module 1, synchronization module 2, and resource allocation module 3; the RRU activation module 1 is used to enable the baseband unit BBU pool to activate the remote radio frequency unit RRU by periodically sending short pulse sequences on the wavelength-specific control channel; The synchronization module 2 is used to enable the BBU pool to broadcast synchronization information and system information to the air interface after activating the RRU, so that the user terminal obtains the synchronization information and system information, so that the user terminal and The cell corresponding to the BBU pool realizes downlink synchronization; and then enables the user terminal to establish a connection with the cell through a random access procedure after realizing downlink synchronization with the cell and realize uplink synchronization; the resource allocation module 3 is used for After the user terminal and the cell realize downlink synchronization and uplink synchronization, within a scheduling period, the BBU pool allocates wireless bandwidth resources for the user terminal according to the buffer status report BSR sent by the user terminal; at the same time , the BBU pool allocates optical wavelength bandwidth resources to the RRU according to the sum of bandwidth request sizes of all the user terminals corresponding to the RRU.

The resource scheduling and control device based on C-RAN provided by the present invention can allocate wireless resources according to the actual needs of user terminals, and at the same time allocate optical bandwidth resources to RRU according to the bandwidth request size of user terminals, greatly reducing signaling Interactive processes, thereby reducing delays. Therefore, reasonable allocation and flexible scheduling of MAC layer resources based on the simulated radio frequency over optical C-RAN can be realized, thereby solving problems such as tidal effects and low resource utilization.

Specifically, the RRU activation module 1 is specifically used for:

causing the BBU pool to periodically send a short pulse sequence to the RRU through a wavelength-dedicated control channel;

After the RRU receives the short pulse sequence, it returns a pulse with the same duration as the short pulse sequence to the BBU pool through the uplink control channel;

After receiving the pulse with the same duration as the short pulse sequence, the BBU pool allocates an initial data wavelength pair to the RRU in a polling manner, thereby activating the RRU.

Wherein, the initial data wavelength pair is used for data transmission between the user terminal and the BBU pool.

The synchronization module 2 is specifically used for:

making the BBU pool send synchronization information and system information to the RRU through a data wavelength channel, and broadcast to the air interface so that the user terminal corresponding to the RRU acquires the synchronization information and system information;

The user terminal is made to complete cell identification and retrieve system information according to the synchronization information and the downlink reference signal in the system information, so as to realize downlink synchronization with the cell, so as to access the cell.

The resource allocation module 3 is specifically used for:

After the BBU pool detects the uplink scheduling request SR sent by the user terminal, allocate uplink resources for the user terminal, so that the user terminal sends a buffer status report BSR;

making the BBU pool allocate wireless bandwidth resources for the user terminal according to the buffer status report BSR sent by the user terminal;

making the BBU pool send the wireless bandwidth resource allocation information to the RRU corresponding to the user terminal, and the RRU corresponding to the user terminal broadcasts the wireless bandwidth resource allocation information to the air interface, so that the The user terminal acquires the wireless resource.

Wherein, the resource allocation module 3 can enable the BBU pool to perform wireless resource scheduling and allocation for the user terminal according to information such as QoS policy, SINR, strategy allocation policy, and cache size.

The resource allocation module 3 is also specifically used for:

making the BBU pool allocate optical wavelength bandwidth resources to the RRU according to the sum of the bandwidth request sizes of all the user terminals corresponding to the RRU, and transmit the optical wavelength bandwidth resource allocation information through a wavelength-dedicated control channel to said RRU;

making the RRU tune to a corresponding wavelength according to the optical wavelength bandwidth resource allocation information.

It should be noted that the scheduling period can be preset, such as 1ms or 2ms, and can also be adjusted adaptively according to business requirements. For example, when the business volume is relatively small, the scheduling period can be adjusted to 2ms, and when the business volume is relatively When it is more, the scheduling period can be adjusted to 1ms.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (10)

1. A resource scheduling and control method based on C-RAN, characterized in that, comprising: The baseband unit BBU pool activates the remote radio frequency unit RRU by periodically sending short pulse sequences on the wavelength-dedicated control channel; After the BBU pool activates the RRU, it broadcasts the synchronization information and system information to the air interface, so that the user terminal obtains the synchronization information and system information, so that the user terminal and the cell corresponding to the BBU pool realize Downlink synchronization; further enabling the user terminal to establish a connection with the cell through a random access procedure after realizing downlink synchronization with the cell and realize uplink synchronization; After the user terminal and the cell realize downlink synchronization and uplink synchronization, within a scheduling period, the BBU pool allocates wireless bandwidth resources for the user terminal according to the buffer status report BSR sent by the user terminal; at the same time, The BBU pool allocates optical wavelength bandwidth resources for the RRU according to the sum of bandwidth request sizes of all the user terminals corresponding to the RRU. 2. The method according to claim 1, wherein the BBU pool activates the RRU by periodically sending a short pulse sequence on a wavelength-dedicated control channel: The BBU pool periodically sends a short pulse sequence to the RRU through a wavelength-dedicated control channel; After receiving the short pulse sequence, the RRU replies a pulse with the same duration as the short pulse sequence to the BBU pool through the uplink control channel; After receiving the pulse with the same duration as the short pulse sequence, the BBU pool allocates an initial data wavelength pair to the RRU in a polling manner, thereby activating the RRU. 3. The method according to claim 1, wherein the BBU pool broadcasts the synchronization information and system information to the air interface, so that the user terminal obtains the synchronization information and system information, so that the user terminal and The downlink synchronization of the cell includes: The BBU pool sends synchronization information and system information to the RRU through a data wavelength channel, and broadcasts to the air interface so that the user terminal corresponding to the RRU obtains the synchronization information and system information; The user terminal completes cell identification and retrieves system information according to the synchronization information and the downlink reference signal in the system information, thereby realizing downlink synchronization with the cell and accessing the cell. 4. The method according to claim 1, wherein the allocation of wireless bandwidth resources for the user terminal by the BBU pool according to the buffer status report BSR sent by the user terminal comprises: After detecting the uplink scheduling request SR sent by the user terminal, the BBU pool allocates uplink resources for the user terminal, so that the user terminal sends a buffer status report BSR; The BBU pool allocates wireless bandwidth resources for the user terminal according to the buffer status report BSR sent by the user terminal; The BBU pool sends the wireless bandwidth resource allocation information to the RRU corresponding to the user terminal, and the RRU corresponding to the user terminal broadcasts the wireless bandwidth resource allocation information to an air interface, so that the user The terminal acquires the wireless resource. 5. The method according to claim 1, wherein the BBU pool allocates optical wavelength bandwidth resources for the RRU according to the sum of the bandwidth request sizes of all the user terminals corresponding to the RRU comprising: The BBU pool allocates the optical wavelength bandwidth resource to the RRU according to the sum of the bandwidth request sizes of all the user terminals corresponding to the RRU, and transmits the optical wavelength bandwidth resource allocation information to the the RRU; The RRU tunes to a corresponding wavelength according to the optical wavelength bandwidth resource allocation information. 6. A resource scheduling and control device based on C-RAN, characterized in that it comprises: The RRU activation module is used to enable the baseband unit BBU pool to activate the remote radio frequency unit RRU by periodically sending short pulse sequences on the wavelength-specific control channel; a synchronization module, configured to enable the BBU pool to broadcast synchronization information and system information to the air interface after activating the RRU, so that the user terminal obtains the synchronization information and system information, so that the user terminal and the The cell corresponding to the BBU pool realizes downlink synchronization; and then enables the user terminal to establish a connection with the cell through a random access process after realizing downlink synchronization with the cell and realize uplink synchronization The resource allocation module is configured to enable the user terminal to achieve downlink synchronization and uplink synchronization with the cell, and within a scheduling period, the BBU pool provides the user terminal with the buffer status report BSR sent by the user terminal Allocating wireless bandwidth resources; at the same time, the BBU pool allocates optical wavelength bandwidth resources for the RRU according to the sum of the bandwidth request sizes of all the user terminals corresponding to the RRU. 7. The device according to claim 6, wherein the RRU activation module is specifically used for: causing the BBU pool to periodically send a short pulse sequence to the RRU through a wavelength-dedicated control channel; After the RRU receives the short pulse sequence, it returns a pulse with the same duration as the short pulse sequence to the BBU pool through the uplink control channel; After receiving the pulse with the same duration as the short pulse sequence, the BBU pool allocates an initial data wavelength pair to the RRU in a polling manner, thereby activating the RRU. 8. The device according to claim 6, wherein the synchronization module is specifically used for: making the BBU pool send synchronization information and system information to the RRU through a data wavelength channel, and broadcast to the air interface so that the user terminal corresponding to the RRU acquires the synchronization information and system information; The user terminal is made to complete cell identification and retrieve system information according to the synchronization information and the downlink reference signal in the system information, so as to realize downlink synchronization with the cell, so as to access the cell. 9. The device according to claim 6, wherein the resource allocation module is specifically configured to: After the BBU pool detects the uplink scheduling request SR sent by the user terminal, allocate uplink resources for the user terminal, so that the user terminal sends a buffer status report BSR; making the BBU pool allocate wireless bandwidth resources for the user terminal according to the buffer status report BSR sent by the user terminal; making the BBU pool send the wireless bandwidth resource allocation information to the RRU corresponding to the user terminal, and the RRU corresponding to the user terminal broadcasts the wireless bandwidth resource allocation information to the air interface, so that the The user terminal acquires the wireless resource. 10. The device according to claim 6, wherein the resource allocation module is specifically configured to: making the BBU pool allocate optical wavelength bandwidth resources to the RRU according to the sum of the bandwidth request sizes of all the user terminals corresponding to the RRU, and transmit the optical wavelength bandwidth resource allocation information through a wavelength-dedicated control channel to said RRU; making the RRU tune to a corresponding wavelength according to the optical wavelength bandwidth resource allocation information.