CN106332226B - Method and apparatus for cell search for MMC network - Google Patents

Method and apparatus for cell search for MMC network Download PDF

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CN106332226B
CN106332226B CN201510332721.7A CN201510332721A CN106332226B CN 106332226 B CN106332226 B CN 106332226B CN 201510332721 A CN201510332721 A CN 201510332721A CN 106332226 B CN106332226 B CN 106332226B
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mmc
antenna
network
base station
pss
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CN106332226A (en
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孙欢
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Alcatel Lucent SAS
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Alcatel Lucent SAS
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0469—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking special antenna structures, e.g. cross polarized antennas into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering

Abstract

The present invention provides a method and apparatus for cell search of an MMC network, wherein the MMC network is a standalone MMC network comprising base stations with large scale antenna arrays. A method comprising, at a base station: simultaneously generating a plurality of transmit beams using all antenna elements of the large-scale antenna array; and simultaneously transmitting a plurality of PSS and SSS to the UE in the MMC cell through a plurality of transmission beams, wherein each PSS or SSS comprises a beam index of a transmission beam corresponding to the PSS or SSS.

Description

Method and apparatus for cell search for MMC network
Technical Field
The present invention relates generally to the field of wireless communications, and more particularly, to a method and apparatus for cell search for MMC networks.
Background
Millimeter Wave (Millimeter-Wave) refers to electromagnetic Wave with frequency in the range of 30GHz to 300GHz, and its wavelength is 1mm-10mm, so it is called Millimeter Wave. The millimeter wave has the advantages of short wavelength, wide frequency band, strong anti-interference performance, good confidentiality, small equipment volume and the like, and can effectively solve a plurality of problems faced by high-speed broadband wireless access, thereby arousing wide attention. On the other hand, however, the millimeter wave is absorbed by rain, air, or the like during propagation, and may cause a serious propagation loss.
Millimeter Wave Communication (MMC) is considered as a key technology in the field of future 5G (fifth generation) wireless Communication, and it is expected that it will support Gigabit (Gigabit) level data Communication. In 5G networks, many conventional schemes to support data transmission should be reconsidered to fit new transmission scenarios.
For example, cell search is a necessary condition for achieving data transmission, which is used to achieve synchronization between a user and a network, and to deliver some basic system information to the user. However, the severe propagation loss of the millimeter wave poses a great challenge to the conventional cell search scheme and affects data transmission.
Disclosure of Invention
In view of the above problems, the present invention provides a method and apparatus for cell search of an MMC network.
According to a first aspect of the present invention, there is provided a method for cell search of an MMC network, wherein the MMC network is a standalone MMC network comprising a base station having a massive antenna array, the method comprising, at the base station: simultaneously generating a plurality of transmit beams using all antenna elements of the large-scale antenna array; and simultaneously transmitting a plurality of PSS and SSS to the UE in the MMC cell through the plurality of transmission beams, wherein each PSS or SSS comprises a beam index of a transmission beam corresponding to the PSS or SSS.
According to a second aspect of the present invention, there is provided a method for cell search of an MMC network, wherein the MMC network is a standalone MMC network comprising a base station with a massive antenna array, the method comprising, at the base station: dividing a plurality of antenna units of the large-scale antenna array into a plurality of antenna groups; generating a transmission beam by one antenna group of the plurality of antenna groups at each time slot; transmitting a PSS and a SSS to a UE in an MMC cell through the transmission beam, wherein a beam index of the transmission beam and time information indicating a beam scanning period of the transmission beam are contained in the PSS or SSS.
According to a third aspect of the present invention, there is provided a method for cell search of an MMC network, wherein the MMC network is a standalone MMC network comprising a base station with a massive antenna array, the method comprising, at the base station: dividing a plurality of antenna units of the large-scale antenna array into a plurality of antenna groups, wherein each two or more antenna groups in the plurality of antenna groups form an antenna group combination; generating, at each time slot, a transmit beam combination comprising two or more transmit beams using two or more of the antenna group combinations; transmitting, by the antenna group combination, a PSS and a SSS to a UE in an MMC cell, wherein a beam combination index corresponding to the transmission beam combination and time information indicating a beam scanning period of the transmission beam combination are contained in the PSS or SSS.
According to a fourth aspect of the present invention, there is provided a method for cell search of an MMC network, wherein the MMC network is a standalone MMC network comprising a base station having a massive antenna array, a plurality of antenna units of which are divided into a plurality of antenna groups or a plurality of antenna group combinations, the method comprising, at the base station: receiving a common RS from the UE; acquiring direction information of the UE according to the public RS; associating the UE with a transmission beam corresponding to one antenna group in a plurality of antenna groups or a transmission beam combination corresponding to one antenna group combination in a plurality of antenna group combinations according to the direction information of the UE; transmitting, to the UE, a PSS and a SSS utilizing the transmit beam or the transmit beam combination.
According to a fifth aspect of the present invention, there is provided a method for cell search of an MMC network, wherein the MMC network coexists with a low frequency network, the method comprising, at a UE of the MMC network: establishing a connection with a base station of the low frequency network; acquiring system information of the MMC network from a base station of the low-frequency network; and establishing connection with a base station of the MMC network by utilizing the system information of the MMC network.
To support MMC in a 5G network, a new cell search scheme should be designed to support both a separate mmwave network and a heterogeneous network in which MMC and LTE cells coexist.
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The present invention will be better understood and other objects, details, features and advantages thereof will become more apparent from the following description of specific embodiments of the invention given with reference to the accompanying drawings. In the drawings:
fig. 1 shows a schematic diagram of a cell search method for an MMC network according to a first embodiment of the present invention;
fig. 2 shows a schematic diagram of a cell search method for an MMC network according to a second embodiment of the present invention;
fig. 3 shows a schematic diagram of a cell search method for an MMC network according to a third embodiment of the present invention;
fig. 4 shows a schematic diagram of a cell search method for an MMC network according to a fourth embodiment of the present invention;
fig. 5 shows a system diagram of a cell search method for an MMC network according to a fifth embodiment of the present invention;
fig. 6 shows a flowchart of a cell search method of the embodiment shown in fig. 5.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
First, a cell search procedure is briefly described by taking an LTE network as an example.
Cell search is the process by which a User Equipment (UE) and a network acquire time and frequency synchronization and detect a cell ID, and generally includes the following steps:
1. the base station broadcasts a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS) to the UE in the cell, after receiving the PSS and the SSS, the UE acquires the physical layer cell ID and time slot Synchronization through the PSS, and acquires the CP (Cyclic Prefix) length, the physical layer cell group ID and the frame Synchronization through the SSS, thereby establishing downlink Synchronization with the base station.
The UE further implements time, frequency synchronization and channel estimation through a downlink RS (Reference Signal) from the base station.
The UE obtains MIB (Master Information Block) by receiving and decoding PBCH (Physical broadcast Channel) from the base station, and obtains SIB (system Information Block) by receiving and decoding PDSCH (Physical Downlink Shared Channel) from the base station, thereby obtaining configuration Information and system Information required for random access with the base station.
For cell search in MMC networks, there may be two application scenarios. One is a scenario in which only the mm wave cell exists, and the other is a scenario in which the mm wave cell and a low frequency cell (e.g., an LTE cell, an LTE-a cell, etc.) coexist. In the following, the proposed solution of the present invention is given for these two scenarios, respectively.
Scene 1: presence of millimeter wave cells only
In this scenario, the propagation loss is large because only a single millimeter wave network exists. Recent studies have shown that at the cell edge of MMC cells with a radius of 200 meters, the propagation loss can reach 140dB (see reference [1 ]). There is an additional 20dB path loss compared to the 2.6GHz microwave of LTE. In this case, it is difficult for a user to perform cell search and synchronize to a searched cell in such an MMC network for the same user-to-base station (eNB) distance as compared to that in the LTE network.
In an MMC, a compact antenna array can be flexibly implemented because the wavelength of millimeter waves is smaller. Large-scale antenna arrays with a large number of antenna elements (elements) can thus be used in the base stations of MMC networks. An antenna array on the transmit side may be used to form a transmit beam to compensate for signal propagation loss within a certain coverage area. For example, in an MMC, a massive antenna array comprising 128 antenna elements may provide 21dB more gain than an omni-directional transmit antenna.
As mentioned above, the transmission beams may enhance the propagation quality within a certain coverage area, which means that only a fraction of users can successfully perform a cell search given a transmission beam. To achieve full coverage of the MMC cell, the following scheme is proposed.
Fig. 1 shows a schematic diagram of a cell search method for an MMC network according to a first embodiment of the present invention. As shown in fig. 1, the MMC network is a separate MMC network that does not coexist with any low frequency network (such as an LTE or LTE-a network). In this MMC network, the MMC base station 10 comprises a massive antenna array with a large number of antenna elements. Further, it is assumed that the base station 10 performs cell search in the cell a.
In this embodiment, all antenna elements of the massive antenna array of the base station 10 transmit simultaneously to generate a plurality of transmit beams, such as beam 1, beam 2, beam 3 shown in fig. 1.
Next, the base station 10 transmits PSS and SSS simultaneously to UEs (not shown) in the MMC cell through multiple transmit beams. Wherein each PSS or SSS contains a beam index of the corresponding transmit beam.
Here, the beam index may be configured at a reserved location in a known PSS or SSS format, or a new PSS or SSS format may be designed.
In this way, the transmission beam of the base station 10 covers the entire MMC cell at the same time, and a UE receiving and successfully decoding the PSS or SSS carried in the transmission beam can acquire the beam index of the corresponding transmission beam and other conventional information (such as cell ID, etc., as described above) carried in the PSS and SSS to achieve downlink synchronization similar to that in a network with a lower frequency band than the MMC network (such as a 3G or 4G cell). Further, the UE will also perform uplink transmission using the beam index to achieve uplink synchronization and other functions.
In the first embodiment, the base station transmits beams simultaneously using all antenna elements of the antenna array, so that each generated transmission beam is wide (as shown in fig. 1), while the cell coverage (i.e., the maximum distance that the UE can successfully access the MMC base station) is limited. In order to improve cell coverage, a beam scanning scheme is proposed, as described below.
Fig. 2 shows a schematic diagram of a cell search method for an MMC network according to a second embodiment of the present invention. As shown in fig. 2, the MMC network is a separate MMC network that does not coexist with any low frequency network (such as an LTE or LTE-a network). In this MMC network, the MMC base station 10 comprises a massive antenna array with a large number of antenna elements. Further, it is assumed that the base station 10 performs cell search in the cell a.
In this embodiment, the antenna elements of the massive antenna array of the base station 10 are divided into antenna groups, each of which may generate a transmit beam, such as beam 1, beam 2, … … beam N shown in fig. 2.
Next, at each slot, the base station 10 generates one transmission beam through one antenna group, and transmits PSS and SSS to UEs in the MMC cell through the transmission beam. Wherein the PSS or SSS contains a beam index of a corresponding transmit beam and a beam sweep period of the transmit beam.
Here, the beam index may be configured at a reserved location in a known PSS or SSS format, or a new PSS or SSS format may be designed.
In this way, the base station 10 achieves full coverage of the cell by performing beam scanning. Since only one transmit beam is used for PSS and SSS transmission in one slot, the transmit beam may provide a large link budget and extend cell coverage.
The UE receiving and successfully decoding the PSS and SSS carried in the transmission beam can obtain the beam index, beam scanning period, and other conventional information of the corresponding transmission beam to achieve downlink and uplink synchronization.
In the second embodiment, the cell coverage is improved, but the cell search period becomes long. The following embodiments are therefore proposed to take into account the trade-off between cell search period and cell coverage.
Fig. 3 shows a schematic diagram of a cell search method for an MMC network according to a third embodiment of the present invention. As shown in fig. 3, the MMC network is a separate MMC network that does not coexist with any low frequency network (such as an LTE or LTE-a network). In this MMC network, the MMC base station 10 comprises a massive antenna array with a large number of antenna elements. Further, it is assumed that the base station 10 performs cell search in the cell a.
In this embodiment, similar to the second embodiment, the plurality of antenna elements of the large-scale antenna array of the base station 10 are divided into a plurality of antenna groups, and each antenna group can generate one transmission beam, such as beam 1, beam 2, … … beam N shown in fig. 3.
Unlike the second embodiment, two or more antenna groups out of the plurality of antenna groups are combined into one antenna group.
Next, at each slot, the base station 10 generates one transmission beam combination by one antenna group combination, and transmits PSS and SSS to UEs in the MMC cell through the transmission beam. Wherein the PSS or SSS includes a beam combination index of a corresponding transmit beam combination and a beam sweep period of the transmit beam combination.
Here, the beam combination index may be configured at a reserved position in a known PSS or SSS format, or a new PSS or SSS format may be designed.
It can be seen that unlike in fig. 1 and 2, in the embodiment of fig. 3 the base station does not transmit simultaneously through all antenna elements, nor only one beam at a time, but a combination of two or more beams at a time. For example, assuming that a combination of two beams is transmitted at a time, the base station 10 may transmit, for example, beam 1 and beam 2 (which may be referred to as beam combination I) in a first time slot, beam 3 and beam 4 (which may be referred to as beam combination II) in a second time slot, and so on. Of course, the invention is not limited thereto, but any combination of beams may be transmitted at a time.
In this implementation, a balance between fast cell search and good cell coverage is achieved since in each slot the base station selects a combination of several beam groups for PSS and SSS transmission.
The UE receiving and successfully decoding the PSS and SSS carried in the transmission beam can obtain the beam combination index, the beam scanning period, and other conventional information of the corresponding transmission beam combination to achieve downlink and uplink synchronization.
Fig. 4 shows a schematic diagram of a cell search method for an MMC network according to a fourth embodiment of the present invention. As shown in fig. 4, the MMC network is a separate MMC network that does not coexist with any low frequency network (such as an LTE or LTE-a network). In this MMC network, the MMC base station 10 comprises a massive antenna array with a large number of antenna elements. Further, it is assumed that the base station 10 performs cell search in the cell a.
Unlike the embodiments shown in fig. 1-3, the embodiment of fig. 4, the cell search is actively initiated by the UE.
The UE first transmits a common Reference Signal (RS).
The base station 10 acquires the direction information of the UE according to the common RS of the UE.
Here, similarly to the second and third embodiments, the antenna units in the large-scale antenna array of the base station 10 are divided into a plurality of antenna groups or antenna group combinations.
The base station may associate the UE with a transmission beam corresponding to one antenna group or a transmission beam combination corresponding to one antenna group combination according to the acquired direction information of the UE, and transmit the PSS and the SSS through the transmission beam or the transmission beam combination to perform downlink and uplink synchronization.
In such an implementation, the UE may transmit the common reference signal periodically or aperiodically as needed to enable the base station to quickly acquire the UE direction and quickly associate a transmit beam or a combination of transmit beams, thereby shortening the beam tracking time and achieving low latency service requirements.
Here, the scheme of the fourth embodiment is preferable for an MMC network supporting a UE to transmit a specific common RS because cell search can be more quickly achieved. However, any of the embodiments of fig. 1-3 may be selected if the UE does not support the transmission of such a specific common RS. That is, the fourth embodiment is well backward compatible with the first to third embodiments.
Scene 2: heterogeneous network with coexisting MMC cell and low-frequency cell
In the initial stage of the 5G network, it is likely to deploy a heterogeneous network in which 5G cells and 4G cells coexist, as shown in fig. 5. In this scenario, since there are low frequency cells of high channel quality, it is possible to overcome the large propagation loss of the MMC network with multiple connections to MMC cells and low frequency cells, enabling fast cell search.
Fig. 5 shows a system diagram of a cell search method for an MMC network according to a fifth embodiment of the present invention; fig. 6 shows a flowchart of a cell search method of the embodiment shown in fig. 5. Unlike the embodiments shown in fig. 1-4, the MMC network is not a separate MMC network, coexisting with a low frequency network (e.g., an LTE or LTE-a network). The MMC network comprises an MMC base station 10, the low frequency network comprises a low frequency base station 20, the UE30 is within coverage of both the MMC network and the low frequency network and has the ability to communicate with both the MMC network and the low frequency network.
As shown in fig. 6, in this embodiment, the MMC base station 10 establishes an association with the low frequency base station 20 in advance to share each other's information. More specifically, the low frequency base station 20 acquires the system information of the MMC network from the MMC base station 10 and stores it in the low frequency base station 20.
Here, the system information of the MMC network may include, for example, at least one of: the system bandwidth of the MMC network, the frequency domain and/or time domain beam mode of the UE and the low-frequency network cell recommendation information of the UE.
First, the UE30 performs random access with the low frequency base station 20 to establish a connection. The process of establishing connection between the UE30 and the lf bs 20 is similar to the prior art, and therefore will not be described in detail.
The difference is that after the UE30 establishes a connection with the low frequency base station 20, it acquires system information of the MMC network from the low frequency base station 20. The system information is transmitted from the low frequency base station 20 to the UE30, for example, through a Physical Downlink Shared Channel (PDSCH).
Next, the UE30 performs an initial access with the MMC base station 10 using the obtained system information of the MMC network to establish a connection.
Since the UE30 can quickly obtain system information of the MMC network, it can quickly perform beam association with the MMC base station, thereby completing cell search.
Here, after obtaining the system information of the MMC network, the access procedure of the UE30 and the MMC base station 10 is similar in the low frequency network (e.g., 4G or 3G network), and thus will not be described again.
In the scenario of scenario 1, the UE and MMC network can perform beam association only in the time domain. Unlike in scenario 1, in the scheme of scenario 2, the UE knows the system information of the MMC network in advance, and thus can perform beam association in both frequency and time domains, thereby further reducing access delay.
In one implementation, after the UE30 establishes the connection with the MMC base station 10, the UE30 still maintains the connection with the low frequency base station 20. In this case, the control of the UE30 may be implemented by the low frequency base station 20, while only data interaction between the UE30 and the MMC base station 10 is performed.
In another implementation, the UE30 no longer maintains the connection with the low frequency base station 20 after establishing the connection with the MMC base station 10. For example, the UE may maintain a connection with the low frequency base station only when it is powered on or just roams into the MMC network, and after obtaining system information of the MMC network, establish a connection with the MMC base station 10 and disconnect the connection with the low frequency base station 20. In this case, after the UE30 establishes a connection with the MMC base station 10, the UE30 is fully controlled by the MMC base station 10. Since this approach does not require maintaining multiple connections all the time, resources of the low frequency network and power consumption of the UE can be saved.
The present invention provides some solutions to implement 5G MMC access and data transmission to support all typical transmission scenarios, including scenarios where 4G and MMC cells coexist and scenarios where MMC cells are deployed separately.
In one or more exemplary designs, the functions described herein may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer. Such computer-readable media can comprise, for example, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to carry or store desired program code means in the form of instructions or data structures and which can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
The various illustrative logical blocks, modules, and circuits described in connection with the disclosure may be implemented or performed with a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosure is provided to enable any person skilled in the art to make or use the present invention. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the present invention is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Reference documents:
[1].Mustafa Riza Akdeniz,Yuanpeng Liu:Millimeter Wave ChannelModeling and Cellular Capacity Evaluation.IEEE Journal on Selected Areas inCommunications 32(6):1164-1179(2014)

Claims (8)

1. a method for cell search of a millimeter wave communication, MMC, network, wherein the MMC network is a standalone MMC network comprising a base station with a massive antenna array, the method comprising, at the base station:
simultaneously generating a plurality of transmit beams using all antenna elements of the large-scale antenna array;
and simultaneously transmitting a plurality of PSS and SSS to the UE in the MMC cell through the plurality of transmission beams, wherein each PSS or SSS comprises a beam index of a transmission beam corresponding to the PSS or SSS.
2. A method for cell search of a millimeter wave communication, MMC, network, wherein the MMC network is a standalone MMC network comprising a base station with a massive antenna array, the method comprising, at the base station:
dividing a plurality of antenna units of the large-scale antenna array into a plurality of antenna groups;
generating a transmission beam by one antenna group of the plurality of antenna groups at each time slot;
transmitting a PSS and a SSS to a UE in an MMC cell through the transmission beam, wherein a beam index of the transmission beam and time information indicating a beam scanning period of the transmission beam are contained in the PSS or SSS.
3. A method for cell search of a millimeter wave communication, MMC, network, wherein the MMC network is a standalone MMC network comprising a base station with a massive antenna array, the method comprising, at the base station:
dividing a plurality of antenna units of the large-scale antenna array into a plurality of antenna groups, wherein each two or more antenna groups in the plurality of antenna groups form an antenna group combination;
generating, at each time slot, a transmit beam combination comprising two or more transmit beams using two or more of the antenna group combinations;
transmitting, by the antenna group combination, a PSS and a SSS to a UE in an MMC cell, wherein a beam combination index corresponding to the transmission beam combination and time information indicating a beam scanning period of the transmission beam combination are contained in the PSS or SSS.
4. A method for cell search of a mmwave communication, MMC, network, wherein the MMC network is a standalone MMC network comprising a base station having a massive antenna array with a plurality of antenna units divided into a plurality of antenna groups or a plurality of antenna group combinations, the method comprising, at the base station:
receiving a common reference signal from a UE;
acquiring direction information of the UE according to the common reference signal;
associating the UE with a transmission beam corresponding to one antenna group in a plurality of antenna groups or a transmission beam combination corresponding to one antenna group combination in a plurality of antenna group combinations according to the direction information of the UE;
transmitting, to the UE, a PSS and a SSS utilizing the transmit beam or the transmit beam combination.
5. A base station for cell search of a millimeter wave communication, MMC, network, wherein the MMC network is a separate MMC network comprising the base station with a massive antenna array, the base station comprising:
a beam generating unit configured to simultaneously generate a plurality of transmit beams using all antenna elements of the massive antenna array;
a transmitting unit configured to simultaneously transmit a plurality of PSS and SSS to a UE in an MMC cell through the plurality of transmission beams, wherein each PSS or SSS includes therein a beam index of a transmission beam corresponding thereto.
6. A base station for cell search of a millimeter wave communication, MMC, network, wherein the MMC network is a separate MMC network comprising the base station with a massive antenna array, the base station comprising:
an antenna dividing unit configured to divide a plurality of antenna units of the large-scale antenna array into a plurality of antenna groups;
a beam generating unit configured to generate one transmission beam with one antenna group of the plurality of antenna groups at each slot;
a transmitting unit configured to transmit a PSS and a SSS to a UE in an MMC cell through the transmission beam, wherein a beam index of the transmission beam and time information indicating a beam scanning period of the transmission beam are contained in the PSS or SSS.
7. A base station for cell search of a millimeter wave communication, MMC, network, wherein the MMC network is a separate MMC network comprising the base station with a massive antenna array, the base station comprising:
an antenna group division unit configured to divide a plurality of antenna units of the large-scale antenna array into a plurality of antenna groups, each two or more of the plurality of antenna groups constituting one antenna group combination;
a beam generating unit configured to generate a transmission beam combination including two or more transmission beams using two or more antenna groups of the antenna group combination at each slot;
a transmitting unit configured to transmit, to a UE in an MMC cell, a PSS and a SSS through the antenna group combination, wherein a beam combination index corresponding to the transmission beam combination and time information indicating a beam scanning period of the transmission beam combination are contained in the PSS or SSS.
8. A base station for cell search of a mmwave communication MMC network, wherein the MMC network is a standalone MMC network comprising the base station with a massive antenna array, a plurality of antenna elements of which are divided into a plurality of antenna groups or a plurality of antenna group combinations, the base station comprising:
a receiving unit configured to receive a common reference signal from a UE;
a direction information acquiring unit configured to acquire direction information of the UE according to the common reference signal;
an association unit configured to associate the UE with a transmission beam corresponding to one antenna group of a plurality of antenna groups or a transmission beam combination corresponding to one antenna group combination of a plurality of antenna group combinations according to direction information of the UE;
a transmitting unit configured to transmit a PSS and a SSS to the UE using the transmit beam or the transmit beam combination.
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