JP6450052B2 - 無線通信システムにおけるチャネルアクセス方法及びこれを行う装置 - Google Patents
無線通信システムにおけるチャネルアクセス方法及びこれを行う装置 Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
-
- 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
- H04W16/14—Spectrum sharing arrangements between different networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
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Description
の場合に、DwPTSとUpPTSを示しており、残りの領域が保護区間として設定される。
OFDMシンボルを含み、周波数領域で
リソースブロックを含む。それぞれのリソースブロックが
副搬送波を含むので、下りリンクスロットは、周波数領域で
副搬送波を含む。図5は、下りリンクスロットが7 OFDMシンボルを含み、リソースブロックが12副搬送波を含むと例示しているが、必ずしもこれに制限されない。例えば、下りリンクスロットに含まれるOFDMシンボルの個数はサイクリックプレフィックス(Cyclic Prefix;CP)の長さによって変形されてもよい。
リソース要素で構成されている。下りリンクスロットに含まれるリソースブロックの数
は、セルで設定される下りリンク送信帯域幅(bandwidth)に従属する。
Claims (15)
- 無線通信システムにおいて基地局が非免許帯域上でチャネルアクセスを行う方法であって、
下りリンク信号を送信するための非免許帯域の搬送波を検出する段階と、
前記搬送波を検出し、検出された電力が前記基地局が設定したエネルギー検出閾値(energy detection threshold)未満の場合、前記下りリンク信号を送信する段階を含み、
前記エネルギー検出閾値は、前記基地局が決定した最大エネルギー検出閾値以下に設定され、
前記搬送波を共有する他のRAT(radio access technology)が存在することができる場合、前記最大エネルギー検出閾値は、基準帯域幅と前記搬送波の帯域幅間の割合のデシベル値を用いて前記搬送波の帯域幅サイズに適応的に決定される、チャネルアクセス方法。 - 前記最大エネルギー検出閾値は、前記基準帯域幅のための最大エネルギー検出閾値の下限(lower bound)と前記デシベル値を合算した第1電力値以上に設定される、請求項1に記載のチャネルアクセス方法。
- 前記第1電力値は、第1式‘−72+10*log10(BWMHz/20MHz)[dBm]’によって獲得され、
前記第1式で、‘20MHz’は前記基準帯域幅を示し、‘BWMHz’は前記搬送波の帯域幅をMHz単位で示したものであり、‘10*log10(BWMHz/20MHz)’は前記デシベル値を示し、‘−72’は前記基準帯域幅のための最大エネルギー検出閾値の下限をdBm単位で示したものである、請求項2に記載のチャネルアクセス方法。 - 前記最大エネルギー検出閾値は、前記デシベル値と前記搬送波に対して設定された前記基地局の最大送信電力間の差を考慮して決定された第2電力値以上に設定される、請求項1〜3のいずれか一項に記載のチャネルアクセス方法。
- 前記第2電力値は、第2式‘min{Tmax、Tmax−TA+(PH+10*log10(BWMHz/20MHz)−PTX)}[dBm]’によって獲得され、
前記第2式で、‘Tmax’は‘10*log10(3.16288*10−8/BWMHz)’であり、‘TA’は前記下りリンク信号の種類によって前もって定義された定数であり、‘PH’は23dBmであり、‘20MHz’は前記基準帯域幅を示し、‘BWMHz’は前記搬送波の帯域幅をMHz単位で示したものであり、‘10*log10(BWMHz/20MHz)’は前記デシベル値を示し、‘PTX’は前記搬送波に対して設定された前記基地局の最大送信電力を示す、請求項4に記載のチャネルアクセス方法。 - 前記最大エネルギー検出閾値は、−72dBmに前記デシベル値を加えて獲得された第1電力値と前記第2電力値のうちもっと大きい値に決定される、請求項5に記載のチャネルアクセス方法。
- 前記下りリンク信号がPDSCH(physical downlink shared channel)を含む場合、‘TA’は10dBに設定され、
前記下りリンク信号がディスカバリー信号を含むが前記PDSCHを含まない場合、‘TA’は5dBに設定される、請求項5に記載のチャネルアクセス方法。 - 前記搬送波を共有する前記他のRATが存在しない場合、前記最大エネルギー検出閾値はTmax+10dBを超えない、請求項5に記載のチャネルアクセス方法。
- 前記下りリンク信号は、LAA(Licensed−Assisted Access)に基づいて動作する少なくとも一つのLAA SCell(Secondary Cell)を介して送信され、前記検出された搬送波は前記少なくとも一つのLAA SCellが位置する搬送波である、請求項1に記載のチャネルアクセス方法。
- 非免許帯域上でチャネルアクセスを行う基地局であって、
下りリンク信号を送信するための非免許帯域の搬送波を検出するプロセッサと、
前記搬送波を検出し、検出された電力が前記基地局が設定したエネルギー検出閾値(energy detection threshold)未満の場合、前記下りリンク信号を送信する送信器を含み、
前記エネルギー検出閾値は、前記基地局が決定した最大エネルギー検出閾値以下に設定され、
前記搬送波を共有する他のRAT(radio access technology)が存在することができる場合、前記最大エネルギー検出閾値は、基準帯域幅と前記搬送波の帯域幅間の割合のデシベル値を用いて前記搬送波の帯域幅サイズに適応的に決定される、基地局。 - 前記最大エネルギー検出閾値は、前記基準帯域幅のための最大エネルギー検出閾値の下限(lower bound)と前記デシベル値を合算した第1電力値以上に設定される、請求項10に記載の基地局。
- 前記第1電力値は、第1式‘−72+10*log10(BWMHz/20MHz)[dBm]’によって獲得され、
前記第1式で、‘20MHz’は前記基準帯域幅を示し、‘BWMHz’は前記搬送波の帯域幅をMHz単位で示したものであり、‘10*log10(BWMHz/20MHz)’は前記デシベル値を示し、‘−72’は前記基準帯域幅のための最大エネルギー検出閾値の下限をdBm単位で示したものである、請求項11に記載の基地局。 - 前記最大エネルギー検出閾値は、前記デシベル値と前記搬送波に対して設定された前記基地局の最大送信電力間の差を考慮して決定された第2電力値以上に設定される、請求項10〜12のいずれか一項に記載の基地局。
- 前記第2電力値は、第2式‘min{Tmax、Tmax−TA+(PH+10*log10(BWMHz/20MHz)−PTX)}[dBm]’によって獲得され、
前記第2式で、‘Tmax’は‘10*log10(3.16288*10−8/BWMHz)’であり、‘TA’は前記下りリンク信号の種類によって前もって定義された定数であり、‘PH’は23dBmであり、‘20MHz’は前記基準帯域幅を示し、‘BWMHz’は前記搬送波の帯域幅をMHz単位で示したものであり、‘10*log10(BWMHz/20MHz)’は前記デシベル値を示し、‘PTX’は前記搬送波に対して設定された前記基地局の最大送信電力を示す、請求項13に記載の基地局。 - 前記最大エネルギー検出閾値は、−72dBmに前記デシベル値を加えて獲得された第1電力値と前記第2電力値のうちもっと大きい値に決定される、請求項14に記載の基地局。
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WO2017034237A1 (ko) | 2017-03-02 |
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