5G NR Operating bands and channel bandwidth

本文详细解析了NR(New Radio)中的关键频谱概念,包括频率范围(FR1和FR2)、运营频带、信道带宽及传输带宽配置。探讨了这些概念之间的层级关系,并提供了具体示例,帮助理解NR网络中的频谱管理和资源分配。

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1.NR frequency range

NR支持两种频率范围:FR1和FR2
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2. Operating band

Operating band是指NR中有编号的、实实际际规定了上下频率边界的一段频带,如下图为FR1内的所有Operating bands,FR2内的Operating bands可参考38101-2,下面的几个概念同理,只用FR1举例。
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3.Channel bandwidth
channel bandwidth是指UE所支持的几种固定的带宽配置,如5MHz、10MHz等,是包含在operating band内的。下两图分别给出FR1和FR2所支持的所有channel bandwidth
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4. Transmission bandwidth configuration是指在上述2中所配置的UE的channel bandwidth内,实际用于发送内容的RB数量,即transmission bandwidth configuration包含在channel bandwidth中,但不是全部占满,其余的部分为guardband。以图中5MHz channel bandwidth、15kHz子载波间隔为例,25个RB占用的带宽是:25每个RB12个子载波每个子载波15kHz+1个预留RE即一个子载波=4515kHz,则剩下的(5MHz-4515kHz)/2=242.5kHz就等于两边要留的最小保护间隔。下两表是FR1的最大RB配置和最小保护间隔情况:
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下两表是FR2的最大RB配置和最小保护间隔情况:
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所以上述几个概念的包含关系如下图:
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### 5G PDCCH Configuration for SIB1 Specification and Implementation Details In the context of Fifth Generation (5G) New Radio (NR), System Information Block Type 1 (SIB1) is crucial as it provides essential information about system configurations to User Equipment (UE). The Physical Downlink Control Channel (PDCCH) plays a significant role in conveying control signaling, including scheduling information for SIB1. For configuring PDCCH specifically for SIB1 transmission, several parameters are critical. The search space settings define where UEs should monitor PDCCH candidates within specific slots or occasions. Common Search Space (CSS) set0 is utilized by default for transmitting downlink control information (DCI) related to SIB1[^1]. This DCI format typically includes Format 1_0 which carries scheduling commands such as resource allocation type A, modulation scheme QPSK, coding rate R=1/2 among others necessary fields required for decoding subsequent messages like MIB/SIBs etc.[^2] Additionally, CORESET (Control Resource Set) defines time-frequency resources over which UE monitors PDCCH carrying DCIs intended for different purposes; one instance being SIB1-related transmissions. It specifies frequency domain positions along with duration across OFDM symbols per slot that can be used for monitoring these channels effectively without causing interference issues between adjacent cells operating on similar frequencies bands simultaneously[^3]. For practical implementation considerations regarding how this configuration might look programmatically when setting up an environment supporting NR standards: ```python from nr_config import NRConfigurator config = NRConfigurator() # Define CORESET configuration for SIB1 coreset_sib1 = { "frequencyDomainResources": "0x7FFFFFFFFF", "duration": 2, } # Configure CSS set0 for SIB1 css_set0_for_sib1 = { "monitoringSymbolsWithinSlot": [1], "nrofCandidates": {"n1": 8}, "aggregationLevel": 4, } config.set_coreset(coreset_id=0, coreset_settings=coreset_sib1) config.configure_css(css_type="commonSearchSpaceSet0", css_settings=css_set0_for_sib1) print(config.get_configuration()) ``` This code snippet demonstrates defining both CORESET and CSS configurations tailored towards ensuring successful reception of SIB1 through appropriate adjustments made at network setup level using hypothetical `nr_config` library functions designed around managing various aspects associated with NR specifications efficiently while adhering closely enough so readers familiarize themselves better understanding real-world applications thereof. --related questions-- 1. What other types of DCI formats exist besides those mentioned here? 2. How does the choice of aggregation levels impact performance metrics during actual deployment scenarios involving multiple users accessing services concurrently via wireless networks utilizing advanced technologies like beamforming antennas arrays integrated into base stations spread geographically apart from each other forming heterogeneous architectures consisting macrocells alongside small cell deployments enhancing overall coverage area capacity gains achievable under ideal conditions assuming no external factors affecting signal propagation characteristics significantly beyond manufacturer's stated tolerances. 3. Can you provide more insight into what happens after receiving SIB1? Specifically concerning additional steps taken post-initial access procedure completion leading eventually toward establishing radio bearers facilitating data exchange processes securely authenticated encrypted manner compliant current industry best practices regulatory requirements applicable jurisdictional boundaries traversed throughout entire communication lifecycle management workflows implemented robust scalable infrastructure platforms capable handling diverse traffic patterns varying widely depending upon application-specific needs ranging simple text messaging social media interactions complex multimedia streaming experiences requiring low latency high throughput connections maintain quality service expectations end-users regardless location device type connectivity medium employed whether fixed mobile satellite-based alternatives available market today offering unprecedented flexibility convenience never before seen history telecommunications evolution driven rapid advancements semiconductor manufacturing techniques enabling miniaturization components reducing power consumption increasing processing speeds opening doors countless possibilities yet unimagined future generations inherit build further innovations atop existing foundations laid out pioneers who came before us shaping digital age we live now experiencing firsthand every day lives improved countless ways thanks largely contributions field communications technology research development efforts spanning decades culminating point present moment looking forward continued growth trajectory ahead lies much promise indeed. 4. In terms of programming interfaces provided by libraries similar to `nr_config`, what kind of methods would they offer for manipulating physical layer parameters involved in LTE versus NR systems considering differences protocol stack architecture design principles underlying each standard respectively? 5. Are there any particular challenges faced when implementing dynamic spectrum sharing features within multi-standard environments incorporating elements drawn from both legacy 4G Long Term Evolution (LTE) frameworks together newer generation 5G Non-Standalone (NSA)/Standalone (SA) modes operation especially focusing interoperability concerns arising due potential conflicts occurring simultaneous usage allocated bandwidth portions reserved either technology independently managed separate entities potentially resulting degraded user experience unless properly addressed beforehand careful planning coordination amongst all stakeholders involved project lifecycles starting initial conception stages ending final rollout phases commercial availability markets worldwide?
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