CN107889166B - Dynamic function allocation method for BBU and RRH - Google Patents
Dynamic function allocation method for BBU and RRH Download PDFInfo
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- CN107889166B CN107889166B CN201711431545.8A CN201711431545A CN107889166B CN 107889166 B CN107889166 B CN 107889166B CN 201711431545 A CN201711431545 A CN 201711431545A CN 107889166 B CN107889166 B CN 107889166B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
Abstract
The invention discloses a dynamic function allocation method of BBU and RRH, according to the difference of user service grade, the channel estimation function will be selected to be completed at RRH or at BBU, establishing a dynamic function allocation between RRH and BBU, improving the system performance; based on the premise that the downlink adopts precoding, precoding processing is selected to be completed at the BBU or at the RRH according to different user service grades, and functions between the RRH and the BBU are dynamically allocated, so that system resources are fully utilized, and system performance is improved. The invention dynamically selects part of functions to be completed at the RRH or the BBU on the uplink and the downlink according to different service grades of users so as to realize the function sharing of the RRH and the BBU, fully utilize system resources and improve the system performance.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a dynamic function allocation method of BBUs and RRHs.
Background
Compared with LTE, 5G provides performance targets of 1000 times system capacity, 10 times peak rate, less than 1ms delay, and 1000 times energy efficiency. With the rapid development of data services and the development of the internet and the internet of things, the future 5G system will also be a seamless overlay network capable of providing services for huge terminals brought by future car networking, internet of things, industrial internet and the like. In order to achieve this ambitious goal, the 5G network must employ a flexible network architecture to achieve optimal function allocation, in addition to making the best use of available frequency resources and advanced technologies as possible.
The radio access network is a link between the mobile terminal equipment and the core network, and comprises a radio frequency receiving part RRH of a base station, a base station processing unit BBU and a base station integrator in a 2G/3G network. In the 2G/3G era, the RRH and the BBU are combined together, so that a bearer network is not needed between the RRH and the BBU, but between the BBU and a core network, the bearer network is a backhaul network. And after 4G/5G, a centralized radio access network C-RAN appears, wherein the BBU is centralized to a BBU pool, the RRH and the BBU are connected by a bearing network, namely a fronthaul network, and a backhaul network is arranged between the BBU pool and a core network.
At present, it is generally considered that RRHs mainly provide a radio frequency processing function of signals, BBUs collectively complete a processing function of baseband signals, and a plurality of RRHs can be connected with one BBU, which can reduce networking cost and improve networking efficiency. However, this can also result in the task of BBU being too burdensome for high traffic, affecting system performance. If dynamic function allocation can be properly carried out on the RRH and the BBU, and the RRH assists the BBU to complete partial functions, system resources can be better utilized, and service quality is improved.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a dynamic function allocation method for BBUs and RRHs, which can fully utilize system resources and improve system performance.
In order to solve the above technical problem, the present invention provides a dynamic function allocation method for BBUs and RRHs, comprising the following steps:
(1) each mobile terminal is communicated with the RRH, and the RRH is communicated with the BBU; in an uplink, a mobile terminal sends pilot frequency and data signals to an RRH, and after receiving information, the RRH determines a user service level according to a user service level requirement;
(2) if the user service level is high, the RRH executes channel estimation to obtain more accurate channel information, and transmits the channel information and the user signal to the BBU; if the user service level is low, the RRH directly transmits the signal to the BBU, and the BBU executes channel estimation to obtain channel information;
(3) the BBU transmits the signal to a core network through a return network;
(4) on a downlink, a BBU receives information transmitted by a return network and determines a user service level according to the service level requirement of a terminal user;
(5) if the user service level is high, designing precoding in the BBU, precoding a signal and sending the signal to the RRH; if the user service level is low, the design of precoding is carried out on the BBU, a precoding matrix and a signal are transmitted to the RRH, and the RRH carries out precoding on the signal according to the precoding matrix provided by the BBU;
(6) the RRH transmits a signal to each mobile terminal.
Preferably, in step (1), one BBU is connected to a plurality of RRHs, and one RRH is connected to a plurality of mobile terminals.
Preferably, in the step (2), the user service level is high, which means that the user service quality requires high rate and low delay; the low service level of the user means that the user service quality requires low rate and high delay.
Preferably, the dynamic function allocation method of the BBU and the RRH is suitable for a wireless network with separated BBUs and RRHs.
The invention has the beneficial effects that: the invention dynamically selects part of functions to be completed at the RRH or the BBU on the uplink and the downlink according to different service grades of users so as to realize the function sharing of the RRH and the BBU, fully utilize system resources and improve the system performance.
Drawings
FIG. 1 is a schematic diagram of a system suitable for use in the present invention.
FIG. 2 is a schematic flow chart of the method of the present invention.
Detailed Description
As shown in fig. 1, a dynamic function allocation method for BBUs and RRHs includes the following steps:
(1) each mobile terminal is communicated with the RRH, and the RRH is communicated with the BBU; in an uplink, a mobile terminal sends pilot frequency and data signals to an RRH, and after receiving information, the RRH determines a user service level according to a user service level requirement;
(2) if the user service level is high, the RRH executes channel estimation to obtain more accurate channel information, and transmits the channel information and the user signal to the BBU; if the user service level is low, the RRH directly transmits the signal to the BBU, and the BBU executes channel estimation to obtain channel information;
(3) the BBU transmits the signal to a core network through a return network;
(4) on a downlink, a BBU receives information transmitted by a return network and determines a user service level according to the service level requirement of a terminal user;
(5) if the user service level is high, designing precoding in the BBU, precoding a signal and sending the signal to the RRH; if the user service level is low, the design of precoding is carried out on the BBU, a precoding matrix and a signal are transmitted to the RRH, and the RRH carries out precoding on the signal according to the precoding matrix provided by the BBU;
(6) the RRH transmits a signal to each mobile terminal.
Referring to fig. 1, each mobile terminal communicates with an RRH, the RRH communicates with a BBU, which is also called a fronthaul network, and the BBU communicates with a core network, which is called a backhaul network. One BBU can connect a plurality of RRHs. One RRH serves a plurality of mobile terminals.
The specific implementation process of the dynamic function allocation method of the BBU and the RRH in the invention is described in the following with reference to the attached FIG. 2:
establishing a dynamic function sharing mechanism of the BBU and the RRH on an uplink; in the uplink, each mobile terminal transmits its signal to the RRH. And after receiving the signal, the RRH determines the service level of the user and executes different processing. Users are classified according to their service levels, such as two: one is users with high quality of service requirements (high rate, low delay); another class of service requires low quality of service users (low rate, high delay). And for the user with high service level, performing channel estimation on the RRH to obtain channel information, and then transmitting the user signal and the estimated channel information to the BBU. In this way, since the RRH receives the most direct wireless signal, the channel estimation is performed here, so that the channel estimation effect is better. And the BBU receives the information from the RRH and then performs corresponding subsequent processing. For the users with low service level, the RRH firstly transmits the user signals to the BBU, and the BBU carries out channel estimation to obtain channel information and carries out other signal processing processes. By distributing the channel estimation process between the RRH and the BBU for users with different service levels, the RRH and the BBU can be better coordinated, and the BBU task is prevented from being too concentrated.
And a precoding technology is adopted on a downlink to establish a dynamic function sharing mechanism of the BBU and the RRH. In downlink, the BBU receives signals from the backhaul network, determines the user service level, and performs different processing. Classifying users according to user service levels: one is users with high quality of service requirements (high rate, low delay); another class of service requires low quality of service users (low rate, high delay). For a user with a high service level, the BBU not only completes the design of a precoding matrix, but also needs to precode and transmit a signal to the RRH, and then the RRH transmits the signal to a terminal user. For users with low service levels, after the BBU designs a precoding matrix, signals are not precoded, only the precoding matrix and corresponding signals are transmitted to the RRH, the RRH performs precoding operation on the signals according to the received precoding matrix, and then the signals are transmitted to terminal users.
According to the invention, the channel estimation function is selected to be completed at the RRH or the BBU according to the difference of the user service grades, and a dynamic function distribution between the RRH and the BBU is established, thereby improving the system performance. Based on the premise that the downlink adopts precoding, precoding processing is selected to be completed at the BBU or at the RRH according to different user service grades, and functions between the RRH and the BBU are dynamically allocated, so that system resources are fully utilized, and system performance is improved. It can be seen that, on the uplink and downlink, the functions of the BBU and the RRH are dynamically adjusted to a certain extent according to different service level requirements of users, so that system resources can be fully utilized, and the performance of a communication system is improved.
The invention designs a dynamic function allocation method of BBU and RRH, which dynamically selects part of functions to be completed in RRH or BBU according to different service grades of users on uplink and downlink, so as to realize the function sharing of RRH and BBU, fully utilize system resources and improve system performance.
Claims (4)
1. A dynamic function allocation method of BBU and RRH is characterized in that the method comprises the following steps:
(1) each mobile terminal is communicated with the RRH, and the RRH is communicated with the BBU; in the uplink, each mobile terminal sends its signal to the RRH, and after receiving the signal, the RRH determines the user service level, executes different processes, and classifies the users according to the user service level: one is users with high service quality requirement, and the other is users with low service quality requirement;
(2) if the user service level is high, the RRH executes channel estimation to obtain more accurate channel information, and transmits the channel information and the user signal to the BBU; if the user service level is low, the RRH directly transmits the signal to the BBU, and the BBU executes channel estimation to obtain channel information;
(3) the BBU transmits the signal to a core network through a return network;
(4) in downlink, BBU receives signals from backhaul network, determines user service level, performs different processing, and classifies users according to user service level: one is users with high service quality requirement, and the other is users with low service quality requirement;
(5) if the user service level is high, designing precoding in the BBU, precoding a signal and sending the signal to the RRH; if the user service level is low, the design of precoding is carried out on the BBU, a precoding matrix and a signal are transmitted to the RRH, and the RRH carries out precoding on the signal according to the precoding matrix provided by the BBU;
(6) the RRH transmits a signal to each mobile terminal.
2. The dynamic function allocation method of BBUs and RRHs of claim 1, wherein in step (1), one BBU is connected to a plurality of RRHs, and one RRH is connected to a plurality of mobile terminals.
3. The dynamic function allocation method of BBUs and RRHs of claim 1, wherein in step (2), the user service level is high, which means that the user service quality requires high rate and low delay; the low service level of the user means that the user service quality requires low rate and high delay.
4. The dynamic function allocation method of BBUs and RRHs of claim 1, wherein the dynamic function allocation method of BBUs and RRHs is applicable to wireless networks in which BBUs and RRHs are separated.
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